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Chapter 51-11C WAC

Last Update: 12/9/19

STATE BUILDING CODE ADOPTION AND AMENDMENT OF THE 2018 EDITION OF THE INTERNATIONAL ENERGY CONSERVATION CODE, COMMERCIAL

WAC Sections

HTMLPDF51-11C-10000Chapter 1 CE—Scope and administration.
HTMLPDF51-11C-10100Section C101—Scope and general requirements.
HTMLPDF51-11C-10140Section C101.4—Applicability.
HTMLPDF51-11C-10143Reserved.
HTMLPDF51-11C-10150Section C101.5—Compliance.
HTMLPDF51-11C-10200Section C102—Alternative materials, design and methods of construction and equipment.
HTMLPDF51-11C-10300Section C103—Construction documents.
HTMLPDF51-11C-10400Section C104—Inspections.
HTMLPDF51-11C-10500Section C105—Validity.
HTMLPDF51-11C-10600Section C106—Referenced standards.
HTMLPDF51-11C-10700Section C107—Fees.
HTMLPDF51-11C-10800Section C108—Stop work order.
HTMLPDF51-11C-10900Section C109—Board of appeals.
HTMLPDF51-11C-11000Section C110—Violations.
HTMLPDF51-11C-11100Section C111—Liability.
HTMLPDF51-11C-20000Chapter 2 CE—Definitions.
HTMLPDF51-11C-20100Section C201—General.
HTMLPDF51-11C-20200Section C202—General definitions.
HTMLPDF51-11C-20201Section C202.1—A.
HTMLPDF51-11C-20202Section C202.2—B.
HTMLPDF51-11C-20203Section C202.3—C.
HTMLPDF51-11C-20204Section C202.4—D.
HTMLPDF51-11C-20205Section C202.5—E.
HTMLPDF51-11C-20206Section C202.6—F.
HTMLPDF51-11C-20207Section C202.7—G.
HTMLPDF51-11C-20208Section C202.8—H.
HTMLPDF51-11C-20209Section C202.9—I.
HTMLPDF51-11C-20210Section C202.10—J.
HTMLPDF51-11C-20211Section C202.11—K.
HTMLPDF51-11C-20212Section C202.12—L.
HTMLPDF51-11C-20213Section C202.13—M.
HTMLPDF51-11C-20214Section C202.14—N.
HTMLPDF51-11C-20215Section C202.15—O.
HTMLPDF51-11C-20216Section C202.16—P.
HTMLPDF51-11C-20217Section C202.17—Q.
HTMLPDF51-11C-20218Section C202.18—R.
HTMLPDF51-11C-20219Section C202.19—S.
HTMLPDF51-11C-20220Section C202.20—T.
HTMLPDF51-11C-20221Section C202.21—U.
HTMLPDF51-11C-20222Section C202.22—V.
HTMLPDF51-11C-20223Section C202.23—W.
HTMLPDF51-11C-20224Section C202.24—X, Y, Z.
HTMLPDF51-11C-30000Chapter 3 CE—General requirements.
HTMLPDF51-11C-30100Section C301—Climate zones.
HTMLPDF51-11C-30200Section C302—Design conditions.
HTMLPDF51-11C-30300Section C303—Materials, systems and equipment.
HTMLPDF51-11C-30310Section 303.1—Identification.
HTMLPDF51-11C-303131Table C303.1.3(1)—Default glazed window, glass door and skylight U-factors.
HTMLPDF51-11C-303132Table C303.1.3(2)—Default door U-factors.
HTMLPDF51-11C-303133Table C303.1.3(3)—Default glazed fenestration SHGC and VT.
HTMLPDF51-11C-303134Table C303.1.3(4)—Default U-factors for skylights.
HTMLPDF51-11C-303135Table C303.1.3(5)—Small business compliance default table.
HTMLPDF51-11C-30315Table C303.1.5—U-factors for spandrel panels and glass curtain walls.
HTMLPDF51-11C-30320Section C303.2—Installation.
HTMLPDF51-11C-30330Reserved.
HTMLPDF51-11C-40000Chapter 4 CE—Commercial energy efficiency.
HTMLPDF51-11C-40100Section C401—General.
HTMLPDF51-11C-40200Section C402—Building envelope requirements.
HTMLPDF51-11C-40210Section C402.1—General (Prescriptive).
HTMLPDF51-11C-40211Section C402.1.1—Low energy buildings.
HTMLPDF51-11C-40212Section C402.1.2—Equipment buildings.
HTMLPDF51-11C-402121Table C402.1.3—Opaque thermal envelope assembly R-value requirements.
HTMLPDF51-11C-40213Section C402.1.3—Insulation component R-value method.
HTMLPDF51-11C-402131Reserved.
HTMLPDF51-11C-402132Reserved.
HTMLPDF51-11C-402133Reserved.
HTMLPDF51-11C-402134Reserved.
HTMLPDF51-11C-40214Section C402.1.4—Assembly U-factor, C-factor, or F-factor-based method.
HTMLPDF51-11C-402141Table C402.1.4—Opaque thermal envelope requirements, U-factor method.
HTMLPDF51-11C-402142Table C402.1.4.1—Effective R-values for steel stud wall assemblies.
HTMLPDF51-11C-40215Section C402.1.5—Component performance alternative.
HTMLPDF51-11C-40220Section C402.2—Specific insulation requirements.
HTMLPDF51-11C-402200Reserved.
HTMLPDF51-11C-40221Section C402.2.1—Roof assembly.
HTMLPDF51-11C-402211Skylight curbs.
HTMLPDF51-11C-40222Reserved.
HTMLPDF51-11C-40223Section C402.2.3—Above-grade walls.
HTMLPDF51-11C-40224Section C402.2.4—Below-grade walls.
HTMLPDF51-11C-40225Section C402.2.5—Floors.
HTMLPDF51-11C-40226Section C402.2.6—Slab-on-grade perimeter insulation.
HTMLPDF51-11C-40227Airspaces.
HTMLPDF51-11C-40228Section C402.2.8—Insulation of radiant heating systems.
HTMLPDF51-11C-40230Section C402.4—Fenestration.
HTMLPDF51-11C-402300Table C402.4—Building envelope requirements—Fenestration.
HTMLPDF51-11C-40231Section C402.4.1—Maximum area.
HTMLPDF51-11C-40232Section C402.4.2—Minimum skylight fenestration area.
HTMLPDF51-11C-40233Section C402.4.3—Maximum U-factor and SHGC.
HTMLPDF51-11C-40234Section C402.4.4—Doors.
HTMLPDF51-11C-40240Section C402.5—Air leakage-thermal envelope.
HTMLPDF51-11C-40241Section C402.5.1—Air barriers.
HTMLPDF51-11C-40242Reserved.
HTMLPDF51-11C-40243Section C402.5.3—Rooms containing fuel-burning appliances.
HTMLPDF51-11C-40244Section C402.5.4—Doors and access openings.
HTMLPDF51-11C-40245Section C402.5.5—Air intakes, exhaust openings, stairways and shafts.
HTMLPDF51-11C-40246Section C402.5.6—Loading dock weatherseals.
HTMLPDF51-11C-40247Section C402.5.7—Vestibules.
HTMLPDF51-11C-40248Section C402.5.8—Recessed lighting.
HTMLPDF51-11C-40250Reserved.
HTMLPDF51-11C-40260Reserved.
HTMLPDF51-11C-40300Section C403—Mechanical systems.
HTMLPDF51-11C-40310Section C403.1—General.
HTMLPDF51-11C-40320Section C403.2—System design.
HTMLPDF51-11C-40321Section C403.2.1—Zone isolation.
HTMLPDF51-11C-40322Section C403.2.2—Ventilation and exhaust.
HTMLPDF51-11C-40323Section C403.2.3—Variable flow capacity.
HTMLPDF51-11C-403231Table C403.3.2(1)—Minimum efficiency requirements—Electrically operated unitary air conditioners and condensing units.
HTMLPDF51-11C-403232Table C403.3.2(2)—Minimum efficiency requirements—Electrically operated unitary and applied heat pumps.
HTMLPDF51-11C-403233Table C403.3.2(3)—Minimum efficiency requirements—Electrically operated PTAC, PTHP, SPVAC, SPVHP, room air conditioners.
HTMLPDF51-11C-403234Table C403.3.2(4)—Minimum efficiency requirements—Warm air furnaces and unit heaters.
HTMLPDF51-11C-403235Table C403.3.2(5)—Minimum efficiency requirements—Gas- and oil-fired boilers.
HTMLPDF51-11C-403236Table C403.3.2(6)—Reserved.
HTMLPDF51-11C-403237Table C403.3.2(7)—Minimum efficiency requirements—Water chilling packages.
HTMLPDF51-11C-403238Table C403.3.2(8)—Minimum efficiency requirements—Heat rejection equipment.
HTMLPDF51-11C-403239Table C403.3.2(9) and Table C403.3.2(10)—Minimum efficiency requirements.
HTMLPDF51-11C-40324Reserved.
HTMLPDF51-11C-403241Reserved.
HTMLPDF51-11C-403242Reserved.
HTMLPDF51-11C-403243Reserved.
HTMLPDF51-11C-403244Reserved.
HTMLPDF51-11C-403245Reserved.
HTMLPDF51-11C-403246Reserved.
HTMLPDF51-11C-403247Reserved.
HTMLPDF51-11C-403248Reserved.
HTMLPDF51-11C-403249Reserved.
HTMLPDF51-11C-40325Reserved.
HTMLPDF51-11C-403251Reserved.
HTMLPDF51-11C-403252Reserved.
HTMLPDF51-11C-403253Reserved.
HTMLPDF51-11C-403254Reserved.
HTMLPDF51-11C-40326Reserved.
HTMLPDF51-11C-403261Reserved.
HTMLPDF51-11C-40327Reserved.
HTMLPDF51-11C-40328Reserved.
HTMLPDF51-11C-403281Reserved.
HTMLPDF51-11C-40329Reserved.
HTMLPDF51-11C-403291Reserved.
HTMLPDF51-11C-403292Reserved.
HTMLPDF51-11C-403293Reserved.
HTMLPDF51-11C-403294Reserved.
HTMLPDF51-11C-403295Reserved.
HTMLPDF51-11C-40330Section C403.3—Equipment selection.
HTMLPDF51-11C-40331Section C403.3.1—Equipment and system sizing.
HTMLPDF51-11C-40332Section C403.3.2—HVAC equipment performance requirements.
HTMLPDF51-11C-40333Section C403.3.3—Hot gas bypass.
HTMLPDF51-11C-40334Section C403.3.4—Boiler turndown.
HTMLPDF51-11C-40335Section C403.3.5—Dedicated outdoor air systems.
HTMLPDF51-11C-40336Section C403.3.6—Ventilation for Group R-2 occupancy.
HTMLPDF51-11C-40340Section C403.4—HVAC system controls.
HTMLPDF51-11C-40341Section C403.4.1—Thermostatic controls.
HTMLPDF51-11C-40342Section C403.4.2—Off-hour controls.
HTMLPDF51-11C-40343Section C403.4.3—Hydronic systems controls.
HTMLPDF51-11C-403431Reserved.
HTMLPDF51-11C-40344Section C403.4.4—Part load controls.
HTMLPDF51-11C-40345Section C403.4.5—Pump isolation.
HTMLPDF51-11C-40346Section C403.4.6—Variable flow controls.
HTMLPDF51-11C-40347Section C403.4.7—Combustion heating equipment controls.
HTMLPDF51-11C-40348Sections C403.4.8 through C403.4.10—Group R requirements.
HTMLPDF51-11C-40349Section C403.4.11—DDC systems.
HTMLPDF51-11C-40350Section C403.5—Economizers.
HTMLPDF51-11C-40351Section C403.5.1—Integrated economizer control.
HTMLPDF51-11C-40352Section C403.5.2—Economizer heating system impact.
HTMLPDF51-11C-40353Section C403.5.3—Air economizers.
HTMLPDF51-11C-40354Section C403.5.4—Waterside economizers.
HTMLPDF51-11C-40355Section C403.5.5—Economizer fault detection and diagnostics.
HTMLPDF51-11C-40360Section C403.6—Requirements for mechanical systems serving multiple zones.
HTMLPDF51-11C-403610Section C403.6.10—High efficiency VAV systems.
HTMLPDF51-11C-4037Section C403.7—Ventilation and exhaust systems.
HTMLPDF51-11C-40371Section C403.7.1—Demand control ventilation.
HTMLPDF51-11C-40372Section C403.7.2—Occupancy sensors.
HTMLPDF51-11C-40373Section C403.7.3—Ventilation air heating control.
HTMLPDF51-11C-40374Section C403.7.4—HVAC serving guestrooms.
HTMLPDF51-11C-40375Section C403.7.5—Loading dock and parking garage ventilation system controls.
HTMLPDF51-11C-40376Section C403.7.6—Energy recovery ventilation systems.
HTMLPDF51-11C-40377Section C403.7.7—Exhaust systems.
HTMLPDF51-11C-40378Section C403.7.8—Shutoff dampers.
HTMLPDF51-11C-4038Section C403.8—Fan and fan controls.
HTMLPDF51-11C-4039Section C403.9—Heat rejection and heat recovery equipment.
HTMLPDF51-11C-40391Section C403.10—Construction of HVAC system elements.
HTMLPDF51-11C-40392Section C403.11—Mechanical systems outside the building envelope.
HTMLPDF51-11C-40393Section C403.12—High efficiency single zone VAV systems.
HTMLPDF51-11C-40400Section C404—Service water heating and pressure-booster systems.
HTMLPDF51-11C-40401Section C404.1—General.
HTMLPDF51-11C-40402Section C404.2—Service water-heating equipment performance efficiency.
HTMLPDF51-11C-404021Table C404.2—Minimum performance of water-heating equipment.
HTMLPDF51-11C-40403Section C404.3—Efficient heated water supply piping.
HTMLPDF51-11C-40404Section C404.4—Heat traps.
HTMLPDF51-11C-40405Section C404.5—Water heater installation.
HTMLPDF51-11C-40406Section C404.6—Pipe insulation.
HTMLPDF51-11C-40407Section C404.7—Heated-water circulating and temperature maintenance systems.
HTMLPDF51-11C-40408Section C404.8—Demand recirculation controls.
HTMLPDF51-11C-40409Section C404.9—Domestic hot water meters.
HTMLPDF51-11C-404091Section C404.10—Drain water heat recovery units.
HTMLPDF51-11C-40410Section C404.11—Pools and spas.
HTMLPDF51-11C-40413Section C404.13—Service water pressure-booster systems.
HTMLPDF51-11C-40500Section C405—Electrical power and lighting systems.
HTMLPDF51-11C-40501Section C405.1—General.
HTMLPDF51-11C-40502Section C405.2—Electrical power and lighting systems.
HTMLPDF51-11C-405021Section C405.2.1—Occupant sensor controls.
HTMLPDF51-11C-405022Section C405.2.2—Time switch controls.
HTMLPDF51-11C-405023Section C405.2.3—Manual controls.
HTMLPDF51-11C-405024Section C405.2.4—Daylight responsive controls.
HTMLPDF51-11C-405025Section C405.2.5—Additional lighting controls.
HTMLPDF51-11C-405026Section C405.2.6—Exterior lighting controls.
HTMLPDF51-11C-405027Reserved.
HTMLPDF51-11C-405028Section C405.2.8—Area controls.
HTMLPDF51-11C-40503Reserved.
HTMLPDF51-11C-40504Reserved.
HTMLPDF51-11C-40505Section C405.4—Interior lighting power requirements.
HTMLPDF51-11C-405051Section C405.4.1—Total connected interior lighting power.
HTMLPDF51-11C-405052Section C405.4.2—Interior lighting power requirements.
HTMLPDF51-11C-405053Table C405.4.2(1)—Interior lighting power allowances—Building area method.
HTMLPDF51-11C-405054Table C405.4.2(2)—Interior lighting power allowances—Space-by-space method.
HTMLPDF51-11C-40506Section C405.5—Exterior lighting.
HTMLPDF51-11C-405061Section C405.5.1—Exterior building grounds lighting.
HTMLPDF51-11C-405062Section C405.5.2—Exterior building lighting power.
HTMLPDF51-11C-405063Table C405.5.3(1)—Exterior lighting zones.
HTMLPDF51-11C-405064Table C405.5.3(2)—Individual lighting power allowances for building exteriors.
HTMLPDF51-11C-40507Section C405.6—Electrical energy consumption.
HTMLPDF51-11C-40508Section C405.8—Electric motors.
HTMLPDF51-11C-40509Section C405.9—Vertical and horizontal transportation systems.
HTMLPDF51-11C-40510Section C405.10—Controlled receptacles.
HTMLPDF51-11C-40511Section C405.11—Voltage drop in feeders and branch circuits.
HTMLPDF51-11C-40512Section C405.12—Electrical commissioning.
HTMLPDF51-11C-40513Reserved.
HTMLPDF51-11C-40600Section C406—Efficiency packages.
HTMLPDF51-11C-40602Section C406.2—HVAC option.
HTMLPDF51-11C-40603Section C406.3—LPA option.
HTMLPDF51-11C-40604Section C406.4—Lighting controls option.
HTMLPDF51-11C-40605Section C406.5—On-site renewable energy option.
HTMLPDF51-11C-40606Section C406.6—DOAS option.
HTMLPDF51-11C-40607Section C406.7—High performance dedicated outdoor air system option.
HTMLPDF51-11C-40608Section C406.8—Service water heating option.
HTMLPDF51-11C-40609Section C406.9—High performance service water heating in multifamily option.
HTMLPDF51-11C-40610Section C406.10—Envelope option.
HTMLPDF51-11C-40611Section C406.11—Air infiltration option.
HTMLPDF51-11C-40612Section C406.12—Commercial kitchen option.
HTMLPDF51-11C-40700Section C407—Total building performance.
HTMLPDF51-11C-40701Section C407.1—Scope.
HTMLPDF51-11C-40702Section C407.2—Mandatory requirements.
HTMLPDF51-11C-40703Section C407.3—Performance-based compliance.
HTMLPDF51-11C-40704Section C407.4—Reserved.
HTMLPDF51-11C-40705Section C407.5—Reserved.
HTMLPDF51-11C-407051Tables for Section C407.5—Carbon emissions factors and building performance factors.
HTMLPDF51-11C-407052Reserved.
HTMLPDF51-11C-407053Reserved.
HTMLPDF51-11C-407054Reserved.
HTMLPDF51-11C-407055Reserved.
HTMLPDF51-11C-40706Section C407.6—Reserved.
HTMLPDF51-11C-40800Section C408—System commissioning.
HTMLPDF51-11C-40801Section C408.1—General.
HTMLPDF51-11C-408012Figure C408.1.4.1—Commissioning compliance checklist.
HTMLPDF51-11C-40802Section C408.2—Mechanical systems commissioning.
HTMLPDF51-11C-40803Section C408.3—Service water heating systems commissioning.
HTMLPDF51-11C-40804Section C408.4—Controlled receptacle and lighting control system commissioning.
HTMLPDF51-11C-408045Section C408.5—Other systems commissioning.
HTMLPDF51-11C-40805Section C408.6—Metering system commissioning.
HTMLPDF51-11C-40807Section C408.7—Refrigeration system commissioning.
HTMLPDF51-11C-40900Section C409—Energy metering and energy consumption management.
HTMLPDF51-11C-40901Section C409.1—General.
HTMLPDF51-11C-40902Section C409.2—Energy source metering.
HTMLPDF51-11C-40903Section C409.3—End-use metering.
HTMLPDF51-11C-40904Section C409.4—Measurement devices, data acquisition system and energy display.
HTMLPDF51-11C-40905Section C409.5—Metering for existing buildings.
HTMLPDF51-11C-41000Section C410—Refrigeration system requirements.
HTMLPDF51-11C-41100Section C411—Solar readiness.
HTMLPDF51-11C-50000Chapter 5 [CE]—Existing buildings.
HTMLPDF51-11C-50200Section C502—Additions.
HTMLPDF51-11C-50300Section C503—Alterations.
HTMLPDF51-11C-50400Section C504—Repairs.
HTMLPDF51-11C-50500Section C505—Change of occupancy or use.
HTMLPDF51-11C-60000Appendix A—Default heat loss coefficients.
HTMLPDF51-11C-600000Chapter 6 [CE]—Referenced standards.
HTMLPDF51-11C-61010Section A101—General.
HTMLPDF51-11C-61011Section A101.1—Scope.
HTMLPDF51-11C-61012Section A101.2—Description.
HTMLPDF51-11C-61013Section A101.3—Air films.
HTMLPDF51-11C-61014Section A101.4—Compression of insulation.
HTMLPDF51-11C-61015Section A101.5—Building materials.
HTMLPDF51-11C-61020Section A102—Ceilings.
HTMLPDF51-11C-61021Section A102.1—General.
HTMLPDF51-11C-610211Table A102.1—Default U-factors for ceilings.
HTMLPDF51-11C-61022Section A102.2—Component description.
HTMLPDF51-11C-610221Tables A102.2.4—Steel truss framed ceiling Uo values.
HTMLPDF51-11C-610225Tables A102.2.5—Default U-factors for metal building roofs.
HTMLPDF51-11C-610226Tables A102.2.6—Assembly U-factors for roofs with insulation entirely above deck.
HTMLPDF51-11C-61030Section A103—Above grade walls.
HTMLPDF51-11C-61031Section A103.1—General.
HTMLPDF51-11C-61032Section A103.2—Framing description.
HTMLPDF51-11C-61033Section A103.3—Component description.
HTMLPDF51-11C-610331Section A103.3.1—Single stud wall.
HTMLPDF51-11C-610332Section A103.3.2—Strap wall.
HTMLPDF51-11C-610333Section A103.3.3—Double stud wall.
HTMLPDF51-11C-610334Section A103.3.4—Log wall.
HTMLPDF51-11C-610335Section A103.3.5—Stress skin panel.
HTMLPDF51-11C-610336Section A103.3.6—Metal stud walls.
HTMLPDF51-11C-610337Section A103.3.7—Concrete and masonry walls.
HTMLPDF51-11C-61040Section A104—Below-grade walls and slabs.
HTMLPDF51-11C-61041Section A104.1—General.
HTMLPDF51-11C-61042Section A104.2—Component description.
HTMLPDF51-11C-61043Section A104.3—Insulation description.
HTMLPDF51-11C-61050Section A105—Floors over unconditioned space.
HTMLPDF51-11C-61051Section A105.1—General.
HTMLPDF51-11C-61052Section A105.2—Crawlspace description.
HTMLPDF51-11C-61053Section A105.3—Construction description.
HTMLPDF51-11C-61060Section A106—On-grade slab floors.
HTMLPDF51-11C-61061Section A106.1—General.
HTMLPDF51-11C-61062Section A106.2—Component description.
HTMLPDF51-11C-61063Section A106.3—Insulation description.
HTMLPDF51-11C-61070Section A107—Default U-factors for doors.
HTMLPDF51-11C-61071Section A107.1—Doors without NFRC certification.
HTMLPDF51-11C-610711Table A107.1(1)—Default U-factors for doors.
HTMLPDF51-11C-610712Table A107.1(2)—Default U-factors for revolving doors.
HTMLPDF51-11C-610713Table A107.1(3)—Default U-factors for steel emergency doors.
HTMLPDF51-11C-610714Table A107.1(4)—Default U-factors for steel garage and hangar doors.
HTMLPDF51-11C-61080Section A108—Air infiltration.
HTMLPDF51-11C-61081Section A108.1—General.
HTMLPDF51-11C-70000Appendix B—Default internal load values and schedules.
HTMLPDF51-11C-71010Section B101—General.
HTMLPDF51-11C-71020Section B102—Default tables of internal loads.
HTMLPDF51-11C-71021Table B102—Acceptable occupancy densities, receptacle power densities and service hot water consumption.
HTMLPDF51-11C-71030Section B103—Default schedules.
HTMLPDF51-11C-71031Table B103(1)—Assembly occupancy.
HTMLPDF51-11C-71032Table B103(2)—Health occupancy.
HTMLPDF51-11C-71033Table B103(3)—Hotel/motel occupancy.
HTMLPDF51-11C-71034Table B103(4)—Light manufacturing occupancy.
HTMLPDF51-11C-71035Table B103(5)—Office occupancy.
HTMLPDF51-11C-71036Table B103(6)—Parking garage occupancy.
HTMLPDF51-11C-71037Table B103(7)—Restaurant occupancy.
HTMLPDF51-11C-71038Table B103(8)—Retail occupancy.
HTMLPDF51-11C-71039Table B103(9)—School and warehouse occupancies.
HTMLPDF51-11C-80000Appendix C—Exterior design conditions.
HTMLPDF51-11C-80100Table C-1—Outdoor design temperatures for Washington.
HTMLPDF51-11C-80500Appendix D—Calculation of HVAC total system performance ratio.
HTMLPDF51-11C-90000Appendix E—Renewable energy.
HTMLPDF51-11C-90500Appendix F—Outcome-based energy budget.


PDF51-11C-10000

Chapter 1 [CE]—Scope and administration.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10000, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-10100

Section C101Scope and general requirements.

C101.1 Title. This code shall be known as the Washington State Energy Code, and shall be cited as such. It is referred to herein as "this code."
C101.2 Scope. This code applies to commercial buildings and the buildings sites and associated systems and equipment. References in this code to Group R shall include Group I-1, Condition 2 assisted living facilities licensed by Washington state under chapter 388-78A WAC and Group I-1, Condition 2 residential treatment facilities licensed by Washington state under chapter 246-337 WAC. Building areas that contain Group R sleeping units, regardless of the number of stories in height, are required to comply with the commercial sections of the energy code.
EXCEPTION:
The provisions of this code do not apply to temporary growing structures used solely for the commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. A temporary growing structure is not considered a building for the purposes of this code. However, the installation of other than listed, portable mechanical equipment or listed, portable lighting fixtures is not allowed.
C101.3 Intent. This code shall regulate the design and construction of buildings for the use and conservation of energy over the life of each building. This code is intended to provide flexibility to permit the use of innovative approaches and techniques to achieve this objective. This code is not intended to abridge safety, health or environmental requirements contained in other applicable codes or ordinances.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10100, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, and chapters 19.27, 19.27A, and 34.05 RCW. WSR 17-17-162, § 51-11C-10100, filed 8/23/17, effective 10/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10100, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10100, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10140

Section C101.4Applicability.

C101.4 Applicability. Where, in any specific case, different sections of this code specify different materials, methods of construction or other requirements, the most restrictive shall govern. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall govern.
C101.4.1Mixed residential and commercial buildings. Where a building includes both residential building and commercialbuilding portions, each portion shall be separately considered and meet the applicable provisions of WSECCommercial Provisions or WSECResidential Provisions.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10140, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10140, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-10140, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-120, § 51-11C-10140, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10140, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10143

Reserved.

[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10143, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-120, § 51-11C-10143, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10143, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10150

Section C101.5Compliance.

C101.5 Compliance.Residential buildings shall meet the provisions of WSECResidential Provisions. Commercial buildings shall meet the provisions of WSECCommercial Provisions.
C101.5.1 Compliance materials. The code official shall be permitted to approve specific computer software, worksheets, compliance manuals and other similar materials that meet the intent of this code.
C101.6 Appendices. Appendices A, B, C, and D are included in the adoption of this code. Provisions in Appendices E and F shall not apply unless specifically adopted by the local jurisdiction.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10150, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10150, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10150, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10200

Section C102Alternative materials, design and methods of construction and equipment.

C102.1 General. The provisions of this code are not intended to prevent the installation of any material, or to prohibit any design or method of construction not specifically prescribed by this code, provided that any such alternative has been approved. An alternative material, design or method of construction shall be approved where the code official finds that the proposed design is satisfactory and complies with the intent of the provisions of this code, and that the material, method or work offered is, for the purpose intended, not less than the equivalent of that prescribed in this code in quality, strength, effectiveness, fire resistance, durability and safety. Where the alternative material, design or method of construction is not approved, the code official shall respond in writing, stating the reasons why the alternative was not approved.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10200, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10200, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10300

Section C103Construction documents.

C103.1 General. Construction documents and other supporting data shall be submitted in one or more sets with each application for a permit. The construction documents shall be prepared by a registered design professional where required by the statutes of the jurisdiction in which the project is to be constructed. Where special conditions exist, the code official is authorized to require necessary construction documents to be prepared by a registered design professional.
EXCEPTION:
The code official is authorized to waive the requirements for construction documents or other supporting data if the code official determines they are not necessary to confirm compliance with this code.
C103.2 Information on construction documents. Construction documents shall be drawn to scale upon suitable material. Electronic media documents are permitted to be submitted when approved by the code official. Construction documents shall be of sufficient clarity to indicate the location, nature and extent of the work proposed, and show in sufficient detail pertinent data and features of the building, systems and equipment as herein governed. Details shall include, but are not limited to, as applicable:
1. Insulation materials and their R-values.
2. Fenestration U-factors and SHGCs.
3. Area-weighted U-factor and SHGC calculations.
4. Mechanical system design criteria.
5. Mechanical and service water heating system and equipment types, sizes and efficiencies.
6. Economizer description.
7. Equipment and systems controls.
8. Fan motor horsepower (hp) and controls.
9. Duct sealing, duct and pipe insulation and location.
10. Lighting fixture schedule with wattage and control narrative.
11. Location of daylight zones on floor plan.
12. Air barrier details including all air barrier boundaries and associated square foot calculations on all six sides of the air barrier as applicable.
C103.2.1 Building thermal envelope depiction. The building's thermal envelope shall be represented on the construction documents.
C103.3 Examination of documents. The code official shall examine or cause to be examined the accompanying construction documents and shall ascertain whether the construction indicated and described is in accordance with the requirements of this code and other pertinent laws or ordinances.
C103.3.1 Approval of construction documents. When the code official issues a permit where construction documents are required, the construction documents shall be endorsed in writing and stamped "Reviewed for Code Compliance." Such approved construction documents shall not be changed, modified or altered without authorization from the code official. Work shall be done in accordance with the approved construction documents.
One set of construction documents so reviewed shall be retained by the code official. The other set shall be returned to the applicant, kept at the site of work and shall be open to inspection by the code official or a duly authorized representative.
C103.3.2 Previous approvals. This code shall not require changes in the construction documents, construction or designated occupancy of a structure for which a lawful permit has been heretofore issued or otherwise lawfully authorized, and the construction of which has been pursued in good faith within 180 days after the effective date of this code and has not been abandoned.
C103.3.3 Phased approval. The code official shall have the authority to issue a permit for the construction of part of an energy conservation system before the construction documents for the entire system have been submitted or approved, provided adequate information and detailed statements have been filed complying with all pertinent requirements of this code. The holders of such permit shall proceed at their own risk without assurance that the permit for the entire energy conservation system will be granted.
C103.4 Amended construction documents. Changes made during construction that are not in compliance with the approved construction documents shall be resubmitted for approval as an amended set of construction documents.
C103.5 Retention of construction documents. One set of approved construction documents shall be retained by the code official for a period of not less than 180 days from date of completion of the permitted work, or as required by state or local laws.
C103.6 Building documentation and close out submittal requirements. The construction documents shall specify that the documents described in this section be provided to the building owner or owner's authorized agent within a maximum of 90 days of the date of receipt of the certificate of occupancy.
C103.6.1 Record documents. Construction documents shall be updated by the installing contractor and architect or engineer of record to convey a record of the completed work. Such updates shall include building envelope, mechanical, plumbing, electrical and control drawings red-lined, or redrawn if specified, that show all changes to size, type and locations of components, equipment and assemblies. Record documents shall include the location and model number of each piece of equipment as installed. The architect, engineer of record or installing contractor is required to provide consolidated record drawings in compliance with this section to the building owner or owner's authorized agent with the timeline specified in Section C103.6.
C103.6.2 Building operations and maintenance information. Required regular maintenance actions for equipment and systems shall be clearly stated on a readily visible label on the equipment. The label shall include the title or publication number for the operation and maintenance manual for that particular model and type of product and the manufacture date or installation date.
C103.6.2.1 Manuals. An operating and maintenance manual shall be provided for each component, device, piece of equipment, and system governed by this code. The manual shall include all of the following:
1. Submittal data indicating all selected options for each piece of equipment and control devices.
2. Manufacturer's operation manuals and maintenance manuals for each device, piece of equipment, and system requiring maintenance, except equipment not furnished as part of the project. Required routine maintenance actions, cleaning and recommended relamping shall be clearly identified.
3. Name and address of at least one service agency.
4. Controls system inspection schedule, maintenance and calibration information, wiring diagrams, schematics, and control sequence descriptions. A schedule for inspecting and recalibrating all lighting controls. Desired or field-determined setpoints shall be permanently recorded on control drawings at control devices or, for digital control systems, on the graphic where settings may be changed.
5. A narrative of how each system is intended to operate, including recommended setpoints. Sequence of operation alone is not acceptable for this requirement.
C103.6.3 Compliance documentation. All energy code compliance forms and calculations shall be delivered in one document to the building owner as part of the project record documents or manuals, or as a standalone document. This document shall include the specific energy code year utilized for compliance determination for each system. NFRC certificates for the installed windows, list of total area for each NFRC certificate, the interior lighting power compliance path (building area, space-by-space) used to calculate the lighting power allowance.
For projects complying with Section C401.2 Item 1, the documentation shall include:
1. The envelope insulation compliance path (prescriptive or component performance).
2. All completed code compliance forms, and all compliance calculations including, but not limited to, those required by sections C402.1.5, C403.2.12.1, C405.4, and C405.5.
For projects complying with Section C401.2 Item 2, the documentation shall include:
1. A list of all proposed envelope component types, areas and U-values.
2. A list of all lighting area types with areas, lighting power allowance, and installed lighting power density.
3. A list of each HVAC system modeled with the assigned and proposed system type.
4. Electronic copies of the baseline and proposed model input and output file. The input files shall be in a format suitable for rerunning the model and shall not consist solely of formatted reports of the inputs.
C103.6.4 Systems operation training. Training of the maintenance staff for equipment included in the manuals required by Section C103.6.2 shall include at a minimum:
1. Review of manuals and permanent certificate.
2. Hands-on demonstration of all normal maintenance procedures, normal operating modes, and all emergency shutdown and start-up procedures.
3. Training completion report.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10300, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-10300, filed 12/6/16, effective 5/1/17; WSR 16-13-089, § 51-11C-10300, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10300, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10300, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10400

Section C104Inspections.

C104.1 General. Construction or work for which a permit is required shall be subject to inspection by the code official, his or her designated agent, or an approved agency, and such construction or work shall remain visible and able to be accessed for inspection purposes until approved. Approval as a result of an inspection shall not be construed to be an approval of a violation of the provisions of this code or of other ordinances of the jurisdiction. Inspections presuming to give authority to violate or cancel the provisions of this code or of other ordinances of the jurisdiction shall not be valid. It shall be the duty of the permit applicant to cause the work to remain visible and able to be accessed for inspection purposes. Neither the code official nor the jurisdiction shall be liable for expense entailed in the removal or replacement of any material, product, system or building component required to allow inspection to validate compliance with this code.
C104.2 Required inspections. The code official, his or her designated agent, or an approved agency, upon notification, shall make the inspections set forth in Sections C104.2.1 through C104.2.6.
C104.2.1 Footing and foundation insulation. Inspections shall verify footing and/or foundation insulation R-value, location, thickness, depth of burial and protection of insulation as required by the code, approved plans and specifications.
C104.2.2 Thermal envelope. Inspections shall be made before application of interior finish and shall verify that envelope components with the correct type of insulation, the R-values, the correct location of insulation, the correct fenestration, the U-factor, SHGC, VT, and air leakage controls are properly installed as required by the code, approved plans and specifications, including envelope components in future tenant spaces of multitenant buildings.
C104.2.3 Plumbing system. Inspections shall verify the type of insulation, the R-values, the protection required, controls, and heat traps as required by the code, approved plans and specifications.
C104.2.4 Mechanical system. Inspections shall verify the installed HVAC equipment for the correct type and size, controls, duct and piping insulation R-values, duct system and damper air leakage, minimum fan efficiency, energy recovery and economizer as required by the code, approved plans and specifications.
C104.2.5 Electrical system. Inspections shall verify lighting system controls, components, meters, motors and installation of an electric meter for each dwelling unit as required by the code, approved plans and specifications.
C104.2.6 Final inspection. The final inspection shall include verification of the installation and proper operation of all required building controls, and documentation verifying activities associated with required building commissioning have been conducted in accordance with Section C408.
C104.3 Reinspection. A building shall be reinspected when determined necessary by the code official.
C104.4 Approved inspection agencies. The code official is authorized to accept reports of approved inspection agencies, provided such agencies satisfy the requirements as to qualifications and reliability relevant to the building components and systems they are inspecting.
C104.5 Inspection requests. It shall be the duty of the holder of the permit or their duly authorized agent to notify the code official when work is ready for inspection. It shall be the duty of the permit holder to provide access to and means for inspections of such work that are required by this code.
C104.6 Reinspection and testing. Where any work or installation does not pass an initial test or inspection, the necessary corrections shall be made so as to achieve compliance with this code. The work or installation shall then be resubmitted to the code official for inspection and testing.
C104.7 Approval. After the prescribed tests and inspections indicate that the work complies in all respects with this code, a notice of approval shall be issued by the code official.
C104.7.1 Revocation. The code official is authorized to, in writing, suspend or revoke a notice of approval issued under the provisions of this code wherever the certificate is issued in error, or on the basis of incorrect information supplied, or where it is determined that the building or structure, premise, or portion thereof is in violation of any ordinance or regulation or any of the provisions of this code.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10400, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-10400, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10400, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-10400, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10400, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10500

Section C105—Validity.

C105.1 General. If a portion of this code is held to be illegal or void, such a decision shall not affect the validity of the remainder of this code.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10500, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10600

Section C106Referenced standards.

C106.1 Referenced codes and standards. The codes and standards referenced in this code shall be those listed in Chapter 5, and such codes and standards shall be considered as part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections C106.1.1 and C106.1.2.
C106.1.1 Conflicts. Where differences occur between provisions of this code and referenced codes and standards, the provisions of this code shall apply.
C106.1.2 Provisions in referenced codes and standards. Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code, as applicable, shall take precedence over the provisions in the referenced code or standard.
C106.2Application of references. References to chapter or section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section or provision of this code.
C106.3 Other laws. The provisions of this code shall not be deemed to nullify any provisions of local, state or federal law. In addition to the requirements of this code, all occupancies shall conform to the provisions included in the State Building Code (chapter 19.27 RCW). In case of conflicts among the codes enumerated in RCW 19.27.031 (1) through (4) and this code, an earlier named code shall govern over those following. In the case of conflict between the duct sealing and insulation requirements of this code and the duct insulation requirements of Sections 603 and 604 of the International Mechanical Code, the duct insulation requirements of this code, or where applicable, a local jurisdiction's energy code shall govern.
[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10600, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10600, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10700

Section C107—Fees.

C107.1 Fees. A permit shall not be issued until the fees prescribed in Section C107.2 have been paid, nor shall an amendment to a permit be released until the additional fee, if any, has been paid.
C107.2 Schedule of permit fees. A fee for each permit shall be paid as required, in accordance with the schedule as established by the applicable governing authority.
C107.3 Work commencing before permit issuance. Any person who commences any work before obtaining the necessary permits shall be subject to an additional fee established by the code official, which shall be in addition to the required permit fees.
C107.4 Related fees. The payment of the fee for the construction, alteration, removal or demolition of work done in connection to or concurrently with the work or activity authorized by a permit shall not relieve the applicant or holder of the permit from the payment of other fees that are prescribed by law.
C107.5 Refunds. The code official is authorized to establish a refund policy.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10700, filed 2/1/13, effective 7/1/13.]



PDF51-11C-10800

Section C108Stop work order.

C108.1 Authority. Whenever the code official finds any work regulated by this code being performed in a manner either contrary to the provisions of this code or dangerous or unsafe, the code official is authorized to issue a stop work order.
C108.2 Issuance. The stop work order shall be in writing and shall be given to the owner of the property involved, or to the owner's agent, or to the person doing the work. Upon issuance of a stop work order, the cited work shall immediately cease. The stop work order shall state the reason for the order, and the conditions under which the cited work will be permitted to resume.
C108.3 Emergencies. Where an emergency exists, the code official shall not be required to give a written notice prior to stopping the work.
C108.4 Failure to comply. Any person who shall continue any work after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be liable to a fine as set by the applicable governing authority.
[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10800, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10800, filed 2/1/13, effective 7/1/13.]



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Section C109—Board of appeals.

C109.1 General. In order to hear and decide appeals of orders, decisions or determinations made by the code official relative to the application and interpretation of this code, there shall be and is hereby created a board of appeals. The code official shall be an ex officio member of said board but shall have no vote on any matter before the board. The board of appeals shall be appointed by the governing body and shall hold office at its pleasure. The board shall adopt rules of procedure for conducting its business, and shall render all decisions and findings in writing to the appellant with a duplicate copy to the code official.
C109.2 Limitations on authority. An application for appeal shall be based on a claim that the true intent of this code or the rules legally adopted thereunder have been incorrectly interpreted, the provisions of this code do not fully apply or an equally good or better form of construction is proposed. The board shall have no authority to waive requirements of this code.
C109.3 Qualifications. The board of appeals shall consist of members who are qualified by experience and training and are not employees of the jurisdiction.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10900, filed 2/1/13, effective 7/1/13.]



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Section C110—Violations.

It shall be unlawful for any person, firm, or corporation to erect or construct any building, or remodel or rehabilitate any existing building or structure in the state, or allow the same to be done, contrary to or in violation of any of the provisions of this code.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-11000, filed 2/1/13, effective 7/1/13.]



PDF51-11C-11100

Section C111—Liability.

Nothing contained in this code is intended to be nor shall be construed to create or form the basis for any liability on the part of any city or county or its officers, employees or agents for any injury or damage resulting from the failure of a building to conform to the provisions of this code.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-11100, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20000

Chapter 2 [CE]—Definitions.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20000, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



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Section C201—General.

C201.1 Scope. Unless stated otherwise, the following words and terms in this code shall have the meanings indicated in this chapter.
C201.2 Interchangeability. Words used in the present tense include the future; words in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural includes the singular.
C201.3 Terms defined in other codes. Terms that are not defined in this code but are defined in the International Building Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, Uniform Plumbing Code or the International Residential Code shall have the meanings ascribed to them in those codes.
C201.4 Terms not defined. Terms not defined by this chapter shall have ordinarily accepted meanings such as the context implies.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20100, filed 2/1/13, effective 7/1/13.]



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Section C202—General definitions.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20200, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20201

Section C202.1A.

ABOVE-GRADE WALL. A wall enclosing conditioned space that is not a below-grade wall. This includes between-floor spandrels, peripheral edges of floors, roof and basement knee walls, dormer walls, gable end walls, walls enclosing a mansard roof and skylight shafts.
ACCESS (TO). That which enables a device, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel or similar obstruction.
ADDITION. An extension or increase in the conditioned space floor area, number of stories, or height of a building or structure.
AIR BARRIER. One or more materials joined together in a continuous manner to restrict or prevent the passage of air through the building thermal envelope and its assemblies.
AIR CURTAIN. A device, installed at the building entrance, that generates and discharges a laminar air stream intended to prevent the infiltration of external, unconditioned air into the conditioned spaces, or the loss of interior, conditioned air to the outside.
ALTERATION. Any construction, retrofit or renovation to an existing structure other than repair or addition. Also, a change in a building, electrical, gas, mechanical or plumbing system that involves an extension, addition or change to the arrangement, type or purpose of the original installation.
APPROVED. Acceptable to the code official.
APPROVED AGENCY. An established and recognized agency regularly engaged in conducting tests or furnishing inspection services, or furnishing product certification research reports, when such agency has been approved by the code official.
ATTIC AND OTHER ROOFS. All other roofs, including roofs with insulation entirely below (inside of) the roof structure (i.e., attics, cathedral ceilings, and single-rafter ceilings), roofs with insulation both above and below the roof structure, and roofs without insulation but excluding roofs with insulation entirely above deck and metal building roofs.
AUTOMATIC. Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current strength, pressure, temperature or mechanical configuration (see "Manual").
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20201, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20201, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20201, filed 2/1/13, effective 7/1/13.]



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Section C202.2B.

BELOW-GRADE WALL. That portion of a wall in the building envelope that is entirely below the finish grade and in contact with the ground.
BLOCK. A generic concept used in energy simulation. It can include one or more thermal zones. It represents a whole building or portion of a building with the same use type served by the same HVAC system type.
BOILER, MODULATING. A boiler that is capable of more than a single firing rate in response to a varying temperature or heating load.
BOILER SYSTEM. One or more boilers, their piping and controls that work together to supply steam or hot water to heat output devices remote from the boiler.
BUBBLE POINT. The refrigerant liquid saturation temperature at a specified pressure.
BUILDING. Any structure used or intended for supporting or sheltering any use or occupancy, including any mechanical systems, service water heating systems and electric power and lighting systems located on the building site and supporting the building.
BUILDING COMMISSIONING. A process that verifies and documents that the building systems have been installed and function according to the approved construction documents.
BUILDING ENTRANCE. Any doorway, set of doors, revolving door, vestibule or other form of portal that is ordinarily used to gain access to the building or to exit from the building by its users and occupants. This does not include doors solely used to directly enter mechanical, electrical and other building utility service equipment rooms, or doors for emergency egress only.
BUILDING SITE. A contiguous area of land that is under the ownership or control of one entity.
BUILDING THERMAL ENVELOPE. The below-grade walls, above-grade walls, floors, ceilings, roofs, and any other building element assemblies that enclose conditioned space or provides a boundary between conditioned space, semiheated space and exempt or unconditioned space.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20202, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20202, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20202, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20203

Section C202.3C.

C-FACTOR (THERMAL CONDUCTANCE). The coefficient of heat transmission (surface to surface) through a building component or assembly, equal to the time rate of heat flow per unit area and the unit temperature difference between the warm side and cold side surfaces (Btu/h ft2 x °F) [W/(m2 x K)].
CAPTIVE KEY DEVICE. A lighting control that will not release the key that activates the override when the lighting is on.
CAVITY INSULATION. Insulating material located between framing members.
CERTIFIED COMMISSIONING PROFESSIONAL. An individual who is certified by an ANSI/ISO/IEC 17024:2012 accredited organization to lead, plan, coordinate and manage commissioning teams and implement the commissioning process.
CHANGE OF OCCUPANCY. A change in the use of a building or a portion of a building that results in any of the following:
1. A change of occupancy classification.
2. A change from one group to another group within an occupancy classification.
3. Any change in use within a group for which there is a change in the application of the requirements of this code.
CIRCULATING HOT WATER SYSTEM. A specifically designed water distribution system where one or more pumps are operated in the service hot water piping to circulate heated water from the water-heating equipment to the fixture supply and back to the water-heating equipment.
CLERESTORY FENESTRATION. See "FENESTRATION."
CLIMATE ZONE. A geographical region based on climatic criteria as specified in this code.
CODE OFFICIAL. The officer or other designated authority charged with the administration and enforcement of this code, or a duly authorized representative.
COEFFICIENT OF PERFORMANCE (COP) - COOLING. The ratio of the rate of heat removal to the rate of energy input, in consistent units, for a complete refrigerating system or some specific portion of that system under designated operating conditions.
COEFFICIENT OF PERFORMANCE (COP) - HEATING. The ratio of the rate of heat removal to the rate of heat delivered to the rate of energy input, in consistent units, for a complete heat pump system, including the compressor and, if applicable, auxiliary heat, under designated operating conditions.
COMMERCIAL BUILDING. For this code, all buildings that are not included in the definition of "Residential buildings."
COMPUTER ROOM. A room whose primary function is to house equipment for the processing and storage of electronic data and that has a design total information technology equipment (ITE) equipment power less than or equal to 20 watts per square foot of conditioned area or a design ITE equipment load less than or equal to 10 kW.
CONDENSING UNIT. A factory-made assembly of refrigeration components designed to compress and liquefy a specific refrigerant. The unit consists of one or more refrigerant compressors, refrigerant condensers (air-cooled, evaporatively cooled, or water-cooled), condenser fans and motors (where used) and factory-supplied accessories.
CONDITIONED FLOOR AREA. The horizontal projection of the floors associated with the conditioned space.
CONDITIONED SPACE. An area, room or space that is enclosed within the building thermal envelope and that is directly heated or cooled or that is indirectly heated or cooled. Spaces are indirectly heated or cooled where they communicate through openings with conditioned spaces, where they are separated from conditioned spaces by uninsulated walls, floors or ceilings, or where they contain uninsulated ducts, piping or other sources of heating or cooling.
CONTINUOUS INSULATION (CI). Insulating material that is continuous across all structural members without metal thermal bridges other than fasteners that have a total cross-sectional area not greater than 0.04 percent of the envelope surface through which they penetrate, and service openings. It is installed on the interior or exterior or is integral to any opaque surface of the building envelope.
CONTROLLED PLANT GROWTH ENVIRONMENT. Group F and U buildings or spaces that are specifically controlled to facilitate and enhance plant growth and production by manipulating various indoor environmental conditions. Technologies include indoor agriculture, cannabis growing, hydroponics, aquaculture and aquaponics. Controlled indoor environment variables include, but are not limited to, temperature, air quality, humidity, and carbon dioxide.
CURTAIN WALL. Fenestration products used to create an external nonload-bearing wall that is designed to separate the exterior and interior environments.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20203, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-20203, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20203, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20203, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-20204

Section C202.4D.

DATA ACQUISITION SYSTEM. An electronic system managed by the building owner to collect, tabulate and display metering information.
DATA CENTER. A room or series of rooms that share data center systems whose primary function is to house equipment for the processing and storage of electronic data, which has a design total information technology equipment (ITE) power density exceeding 20 watts per square foot of conditioned area and a total design ITE equipment load greater than 10 kW.
DATA CENTER SYSTEMS. HVAC systems, electrical systems, equipment, or portions thereof used to condition ITE or electrical systems in a data center.
DAYLIGHT RESPONSIVE CONTROL. A device or system that provides automatic control of electric light levels based on the amount of daylight in a space.
DAYLIGHT ZONE. The portion of the building interior floor area that is illuminated by natural daylight through sidelit and toplit fenestration.
DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames.
DEMAND CONTROL VENTILATION (DCV). A ventilation system capability that provides for the automatic reduction of outdoor air intake below design rates when the actual occupancy of spaces served by the system is less than design occupancy.
DEMAND RECIRCULATION WATER SYSTEM. A water distribution system having one or more recirculation pumps that pump water from a heated water supply pipe back to the heated water source through a cold water supply pipe.
DOOR, GARAGE. Doors rated by ASMA 105 with a single panel or sectional panels.
DOOR, NONSWINGING. Roll-up, tilt-up, metal coiling and sliding doors, access hatches, and all other doors that are not swinging doors or garage doors with less than or equal to 14 percent glazing.
DOOR, SWINGING. Doors that are hinged on one side and revolving doors.
DUCT. A tube or conduit utilized for conveying air. The air passages of self-contained systems are not to be construed as air ducts.
DUCT SYSTEM. A continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment and appliances.
DWELLING UNIT. A single unit providing complete independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation.
DX-DEDICATED OUTDOOR AIR SYSTEM UNITS (DX-DOAS UNITS). A type of air-cooled, water-cooled or water source factory assembled product that dehumidifies 100 percent outdoor air to a low dew point and includes reheat that is capable of controlling the supply dry-bulb temperature of the dehumidified air to the designated supply air temperature. This conditioned outdoor air is then delivered directly or indirectly to the conditioned spaces. It may precondition outdoor air by containing an enthalpy wheel, sensible wheel, desiccant wheel, plate heat exchanger, heat pipes, or other heat or mass transfer apparatus.
DYNAMIC GLAZING. Any fenestration product that has the fully reversible ability to change its performance properties, including U-factor, SHGC, or VT.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20204, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-20204, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20204, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20204, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20205

Section C202.5E.

ECONOMIZER, AIR. A duct and damper arrangement and automatic control system that allows a cooling system to supply outside air to reduce or eliminate the need for mechanical cooling during mild or cold weather.
ECONOMIZER, WATER. A system where the supply air of a cooling system is cooled indirectly with water that is itself cooled by heat or mass transfer to the environment without the use of mechanical cooling.
ELECTRICAL LOAD COEFFICIENT (ELC). In a data center, the ratio of the sum of three specific electrical losses (or losses calculated from efficiencies) to the ITE load itself. Specifically, ELC equals the sum of the incoming (to ITE) electrical service losses, UPS losses, and ITE distribution losses all divided by the peak ITE load. The design ELC is calculated at the full load design condition with active redundant equipment engaged, and the annual ELC is calculated the same way because it is assumed that ITE runs constantly at full power all year.
ENCLOSED SPACE. A volume surrounded by solid surfaces such as walls, floors, roofs, and openable devices such as doors and operable windows.
END USE CATEGORY. A load or group of loads that consume energy in a common or similar manner.
ENERGY ANALYSIS. A method for estimating the annual energy use of the proposed design and standard reference design based on estimates of energy use.
ENERGY COST. The total estimated annual cost for purchased energy for the building functions regulated by this code, including applicable demand charges.
ENERGY RECOVERY VENTILATION SYSTEM. Systems that employ air-to-air heat exchangers to recover energy from exhaust air for the purpose of preheating, precooling, humidifying or dehumidifying outdoor ventilation air prior to supplying the air to a space, either directly or as part of an HVAC system.
ENERGY SIMULATION TOOL. An approved software program or calculation-based methodology that projects the annual energy use of a building.
ENERGY SOURCE METER. A meter placed at the source of the incoming energy that measures the energy delivered to the whole building or metered space.
ENTRANCE DOOR. A vertical fenestration product used for occupant ingress, egress and access in nonresidential buildings including, but not limited to, exterior entrances utilizing latching hardware and automatic closers and containing over 50 percent glazing specifically designed to withstand heavy duty usage.
EQUIPMENT ROOM. A space that contains either electrical equipment, mechanical equipment, machinery, water pumps or hydraulic pumps that are a function of the building's services.
EXTERIOR WALL. Walls including both above-grade walls and below-grade walls.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20205, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20205, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20206

Section C202.6F.

FAN BRAKE HORSEPOWER (BHP). The horsepower delivered to the fan's shaft. Brake horsepower does not include the mechanical drive losses (belts, gears, etc.).
FAN EFFICIENCY GRADE (FEG). A numerical rating identifying the fan's aerodynamic ability to convert shaft power, or impeller power in the case of a direct-driven fan, to air power.
FAN SYSTEM BHP. The sum of the fan brake horsepower of all fans that are required to operate at fan system design conditions to supply air from the heating or cooling source to the conditioned space(s) and return it to the source or exhaust it to the outdoors.
FAN SYSTEM DESIGN CONDITIONS. Operating conditions that can be expected to occur during normal system operation that result in the highest supply fan airflow rate to conditioned spaces served by the system, other than during air economizer operation.
FAN SYSTEM MOTOR NAMEPLATE HP. The sum of the motor nameplate horsepower of all fans that are required to operate at design conditions to supply air from the heating or cooling source to the conditioned space(s) and return it to the source or exhaust it to the outdoors.
FENESTRATION. Products classified as either skylights or vertical fenestration.
SKYLIGHTS. Glass or other transparent or translucent glazing material installed at a slope of less than 60 degrees (91.05 rad) from horizontal, including unit skylights, tubular daylighting devices and glazing materials in solariums, sunrooms, roofs and sloped walls.
VERTICAL FENESTRATION. Windows that are fixed or operable, doors with more than 50 percent glazed area and glazed block composed of glass or other transparent or translucent glazing materials and installed at a slope not less than 60 degrees (91.05 rad) from horizontal. Opaque areas such as spandrel panels are not considered vertical fenestration.
CLERESTORY FENESTRATION. An upper region of vertical fenestration provided for the purpose of admitting daylight beyond the perimeter of a space. The entire clerestory fenestration assembly is installed at a height greater than 8 feet above the finished floor.
FENESTRATION AREA. Total area of the fenestration measured using the rough opening, and including the glazing, sash and frame.
FENESTRATION PRODUCT, FIELD-FABRICATED. A fenestration product whose frame is made at the construction site of standard dimensional lumber or other materials that were not previously cut, or otherwise formed with the specific intention of being used to fabricate a fenestration product or exterior door. Field fabricated does not include site-built fenestration.
FENESTRATION PRODUCT, SITE-BUILT. A fenestration designed to be made up of field-glazed or field-assembled units using specific factory cut or otherwise factory-formed framing and glazing units. Examples of site-built fenestration include storefront systems, curtain walls, and atrium roof systems.
F-FACTOR. The perimeter heat loss factor for slab-on-grade floors (Btu/h x ft x °F) [W/(m x K)].
FLOOR AREA, NET. The actual occupied area not including unoccupied accessory areas such as corridors, stairways, toilet rooms, mechanical rooms and closets.
FURNACE ELECTRICITY RATIO. The ratio of furnace electricity use to total furnace energy computed as ratio = (3.412 x EAE)/1000 x EF + 3.412 x EAE) where EAE (average annual auxiliary electrical consumption) and EF (average annual fuel energy consumption) are defined in Appendix N to Subpart B of Part 430 of Title 10 of the Code of Federal Regulations and EF is expressed in millions of Btus per year.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20206, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20206, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20206, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-20207

Section C202.7G.

GENERAL LIGHTING. Lighting that provides a substantially uniform level of illumination throughout an area. General lighting shall not include lighting that provides a dissimilar level of illumination to serve a specific application or decorative feature within such area.
GREENHOUSE. A permanent structure or a thermally isolated area of a building that maintains a specialized sunlit environment that is used exclusively for, and is essential to, the cultivation, protection or maintenance of plants. Greenhouses are those that are erected for a period of 180 days or more.
GROUP R. Buildings or portions of buildings that contain any of the following occupancies as established in the International Building Code:
1. Group R-1.
2. Group R-2 where located more than three stories in height above grade plane.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20207, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20207, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20207, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20208

Section C202.8H.

HEAT TRAP. An arrangement of piping and fittings, such as elbows, or a commercially available heat trap that prevents thermosyphoning of hot water during standby periods.
HEAT TRAP, PIPE CONFIGURED. A pipe configured heat trap is either, as applicable:
1. A device specifically designed for the purpose or an arrangement of tubing that forms a loop of 360 degrees; or
2. Piping that from the point of connection to the water heater (inlet or outlet) includes a length of piping directed downward before connection to the vertical piping of the supply water or hot-water distribution system.
HEATED SLAB-ON-GRADE FLOOR. Slab-on-grade floor construction in which the heating elements, hydronic tubing, or hot air distribution system is in contact with, or placed within or under, the slab.
HEATED WATER CIRCULATION SYSTEM. A water distribution system having one or more recirculation pumps that pump water from a heated water source through a dedicated hot water circulation pipe or piping system.
HIGH SPEED DOOR. A nonswinging door used primarily to facilitate vehicular access or material transportation, with a minimum opening rate of 32 inches (813 mm) per second, a minimum closing rate of 24 inches (610 mm) per second and that includes an automatic-closing device.
HISTORIC BUILDINGS. Buildings that are listed in or eligible for listing in the National Register of Historic Places, or designated as historic under an appropriate state or local law.
HUMIDISTAT. A regulatory device, actuated by changes in humidity, used for automatic control of relative humidity.
HVAC TOTAL SYSTEM PERFORMANCE RATIO (HVAC TSPR). The ratio of the sum of a building's annual heating and cooling load in thousands of Btus to the sum of annual carbon emissions in pounds from energy consumption of the building HVAC systems. Carbon emissions shall be calculated by multiplying site energy consumption by the carbon emission factors from Table C407.1.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20208, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20208, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20208, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20209

Section C202.9I.

IEC DESIGN H MOTOR. An electric motor that meets all of the following:
1. It is an induction motor designed for use with three-phase power.
2. It contains a cage rotor.
3. It is capable of direct-on-line starting.
4. It has 4, 6 or 8 poles.
5. It is rated from 0.4 kW to 1600 kW at a frequency of 60 Hz.
IEC DESIGN N MOTOR. An electric motor that meets all of the following:
1. It is an inductor motor designed for use with three-phase power.
2. It contains a cage rotor.
3. It is capable of direct-on-line starting.
4. It has 2, 4, 6 or 8 poles.
5. It is rated from 0.4 kW to 1600 kW at a frequency of 60 Hz.
INFILTRATION. The uncontrolled inward air leakage into a building caused by the pressure effects of wind or the effect of differences in the indoor and outdoor air density or both.
INFORMATION TECHNOLOGY EQUIPMENT (ITE). ITE includes computers, data storage, servers and network/communications equipment.
INSULATION ENTIRELY ABOVE DECK. A roof with all insulation:
1. Installed above (outside of) the roof structure; and
2. Continuous (i.e., uninterrupted by framing members).
INTEGRATED ENERGY EFFICIENCY RATIO (IEER). A single-number figure of merit expressing cooling part-load EER efficiency for unitary air-conditioning and heat pump equipment on the basis of weighted operation at various load capacities for the equipment.
INTEGRATED PART LOAD VALUE (IPLV). A single number figure of merit based on part-load EER, COP, or kW/ton expressing part-load efficiency for air conditioning and heat pump equipment on the basis of weighted operation at various load capacities for equipment.
INTEGRATED SEASONAL COEFFICIENT OF PERFORMANCE (ISCOP). A seasonal efficiency number that is a combined value based on the formula listed in AHRI Standard 920 of the two COP values for the heating season of a DX-DOAS unit water or air source heat pump, expressed in W/W.
INTEGRATED SEASONAL MOISTURE REMOVAL EFFICIENCY (ISMRE). A seasonal efficiency number that is a combined value based on the formula listed in AHRI Standard 920 of the four dehumidification moisture removal efficiency (MRE) ratings required for DX-DOAS units, expressed in lb. of moisture/kWh.
ISOLATION DEVICES. Devices that isolate HVAC zones so they can be operated independently of one another. Isolation devices include separate systems, isolation dampers and controls providing shutoff at terminal boxes.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20209, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20209, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20209, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20210

Section C202.10—J.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20210, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20211

Section C202.11—K.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20211, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20212

Section C202.12L.

LABELED. Equipment, materials or products to which have been affixed a label, seal, symbol or other identifying mark of a nationally recognized testing laboratory, approvedagency or other organization concerned with product evaluation that maintains periodic inspection of the production of the above-labeled items and whose labeling indicates either that the equipment, material or product meets identified standards or has been tested and found suitable for a specified purpose.
LINER SYSTEM (LS). A system that includes the following:
1. A continuous vapor barrier liner membrane that is installed below the purlins and that is uninterrupted by framing members.
2. An uncompressed, unfaced insulation resting on top of the liner membrane and located between the purlins.
For multilayer installations, the last rated R-value of insulation is for unfaced insulation draped over purlins and then compressed when the metal roof panels are attached.
LISTED. Equipment, materials, products or services included in a list published by an organization acceptable to the code official and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and whose listing states either that the equipment, material, product or service meets identified standards or has been tested and found suitable for a specified purpose.
LOW-SLOPED ROOF. A roof having a slope less than 2 units vertical in 12 units horizontal.
LOW-VOLTAGE DRY-TYPE DISTRIBUTION TRANSFORMER. A transformer that is air-cooled, does not use oil as a coolant, has an input voltage less than or equal to 600 volts and is rated for operation at a frequency of 60 hertz.
LOW-VOLTAGE LIGHTING. A lighting system consisting of an isolating power supply, the low voltage luminaires, and associated equipment that are all identified for the use.
LUMINAIRE. A complete lighting unit consisting of a lamp or lamps together with the housing designed to distribute the light, position and protect the lamps, and connect the lamps to the power supply.
LUMINAIRE-LEVEL LIGHTING CONTROL. A lighting system consisting of one or more luminaires where each luminaire has embedded lighting control logic, occupancy and ambient light sensors, and local override switching capability, where required. Each luminaire shall also have wireless networking capabilities to detect and share information with other luminaires to adjust to occupancy and/or daylight in the space.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20212, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-20212, filed 5/2/17, effective 6/2/17; WSR 16-24-070, § 51-11C-20212, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20212, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20212, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20213

Section C202.13M.

MANUAL. Capable of being operated by personal intervention (see "Automatic").
MASS TRANSFER DECK SLAB EDGE. That portion of the above-grade wall made up of the concrete slab where it extends past the footprint of the floor above, and there is space (conditioned or unconditioned) below the slab. The area of the slab edge shall be defined as the thickness of the slab multiplied by the perimeter of the edge condition. Examples of this condition include, but are not limited to, the transition from an above-grade structure to a below-grade structure or the transition from a tower to a podium. Cantilevered balconies do not meet this definition.
MECHANICAL COOLING. Reducing the temperature of a gas or liquid by using vapor compression, absorption, desiccant dehumidification combined with evaporative cooling, or another energy-driven thermodynamic cycle. Indirect or direct evaporative cooling alone is not considered mechanical cooling.
MECHANICAL HEATING. Raising the temperature of a gas or liquid by use of fossil fuel burners, electric resistance heaters, heat pumps, or other systems that require energy to operate.
MECHANICAL LOAD COEFFICIENT (MLC). In a data center, the ratio of the cooling system's net use of energy to that of the ITE. The design MLC is calculated for a local peak weather condition (stipulated in ASHRAE Standard 90.4) and equals the sum of all active cooling equipment input power, divided by total power into the ITE. The annual MLC is calculated using hourly TMY3 weather data for the data center's location and equals the sum of all energy flowing into the cooling system to respond to that weather, minus any energy successfully recovered to avoid any new energy use, all divided by the energy flowing into the ITE during the same period.
METAL BUILDING ROOF. A roof that:
1. Is constructed with a metal, structural, weathering surface;
2. Has no ventilated cavity; and
3. Has the insulation entirely below deck (i.e., does not include composite concrete and metal deck construction nor a roof framing system that is separated from the superstructure by a wood substrate) and whose structure consists of one or more of the following configurations:
a. Metal roofing in direct contact with the steel framing members;
b. Metal roofing separated from the steel framing members by insulation;
c. Insulated metal roofing panels installed as described in a or b.
METAL BUILDING WALL. A wall whose structure consists of metal spanning members supported by steel structural members (i.e., does not include spandrel glass or metal panels in curtain wall systems).
METER. A device that measures the flow of energy.
MICROCELL. A wireless communication facility consisting of an antenna that is either: (a) Four (4) feet in height and with an area of not more than 580 square inches; or (b) if a tubular antenna, no more than four (4) inches in diameter and no more than six (6) feet in length; and the associated equipment cabinet that is six (6) feet or less in height and no more than 48 square feet in floor area.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20213, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20213, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20213, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20214

Section C202.14N.

NAMEPLATE HORSEPOWER. The nominal motor output power rating stamped on the motor nameplate.
NEMA DESIGN A MOTOR. A squirrel-cage motor that meets all of the following:
1. It is designed to withstand full-voltage starting and developing locked-rotor torque as shown in paragraph 12.38.1 of NEMA MG 1.
2. It has pull-up torque not less than the values shown in paragraph 12.40.1 of NEMA MG 1.
3. It has breakdown torque not less than the values shown in paragraph 12.39.1 of NEMA MG 1.
4. It has a locked-rotor current higher than the values shown in paragraph 12.35.1 of NEMA MG 1 for 60 Hz and paragraph 12.35.2 of NEMA MG 1 for 50 Hz.
5. It has a slip at rated load of less than 5 percent for motors with fewer than 10 poles.
NEMA DESIGN B MOTOR. A squirrel-cage motor that meets all of the following:
1. It is designed to withstand full-voltage starting.
2. It develops locked-rotor, breakdown and pull-up torques adequate for general application as specified in Sections 12.38, 12.39 and 12.40 of NEMA MG 1.
3. It draws locked-rotor current not to exceed the values shown in paragraph 12.35.1 of NEMA MG 1 for 60 Hz and paragraph 12.35.2 of NEMA MG 1 for 50 Hz.
4. It has a slip at rated load of less than 5 percent for motors with fewer than 10 poles.
NEMA DESIGN C MOTOR. A squirrel-cage motor that meets all of the following:
1. It is designed to withstand full-voltage starting and developing locked-rotor torque for high-torque applications up to the values shown in paragraph 12.38.2 of NEMA MG 1 (incorporated by reference; see Sec. 431.15).
2. It has pull-up torque not less than the values shown in paragraph 12.40.2 of NEMA MG 1.
3. It has breakdown torque not less than the values shown in paragraph 12.39.2 of NEMA MG 1.
4. It has a locked-rotor current not to exceed the values shown in paragraph 12.35.1 of NEMA MG 1 for 60 Hz and paragraph 12.35.2 of NEMA MG 1 for 50 Hz.
5. It has a slip at rated load of less than 5 percent.
NETWORKED GUEST ROOM CONTROL SYSTEM.  A control system, accessible from the front desk or other central location associated with a Group R-1 building, that is capable of identifying the occupancy status of each guest room according to a timed schedule, and is capable of controlling HVAC in each hotel and motel guest room separately.
NONSTANDARD PART LOAD VALUE (NPLV). A single-number part-load efficiency figure of merit calculated and referenced to conditions other than IPLV conditions, for units that are not designed to operate at ARI standard rating conditions.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20214, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20214, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20215

Section C202.15O.

OCCUPANT SENSOR CONTROL. An automatic control device or system that detects the presence or absence of people within an area and causes lighting, equipment or appliances to be regulated accordingly.
ON-SITE RENEWABLE ENERGY. Energy derived from solar radiation, wind, waves, tides, landfill gas, biogas, biomass, or the internal heat of the earth. The energy system providing on-site renewable energy shall be located on the project site.
OPAQUE DOOR. A door that is not less than 50 percent opaque in surface area.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20215, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20215, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20215, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20216

Section C202.16P.

PERSONAL WIRELESS SERVICE FACILITY. A wireless communication facility (WCF), including a microcell, which is a facility for the transmission and/or reception of radio frequency signals and which may include antennas, equipment shelter or cabinet, transmission cables, a support structure to achieve the necessary elevation, and reception and/or transmission devices or antennas.
POWERED ROOF/WALL VENTILATORS. A fan consisting of a centrifugal or axial impeller with an integral driver in a weather-resistant housing and with a base designed to fit, usually by means of a curb, over a wall or roof opening.
POWER-OVER-ETHERNET LIGHTING (POE). Lighting sources powered by DC current utilizing Ethernet cables.
PROPOSED DESIGN. A description of the proposed building used to estimate annual energy use and carbon emissions from energy consumption for determining compliance based on total building performance and HVAC total performance ratio.
PUBLIC LAVATORY FAUCET. A lavatory faucet that is not intended for private use as defined by the Uniform Plumbing Code and that is supplied with both potable cold and hot water.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20216, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20216, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20216, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20217

Section C202.17—Q.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20217, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20218

Section C202.18R.

RADIANT HEATING SYSTEM. A heating system that transfers heat to objects and surfaces within a conditioned space, primarily by infrared radiation.
READY ACCESS (TO). That which enables a device, appliance or equipment to be directly reached, without requiring the removal or movement of any panel or similar obstruction.
REFRIGERANT DEW POINT. The refrigerant vapor saturation temperature at a specified pressure.
REFRIGERATED WAREHOUSE COOLER. An enclosed storage space that has a total chilled storage area of 3,000 ft2 or greater and is designed to maintain a temperature of greater than 32°F but less than 55°F.
REFRIGERATED WAREHOUSE FREEZER. An enclosed storage space that has a total chilled storage area of 3,000 ft2 or greater and is designed to maintain a temperature at or below 32°F.
REFRIGERATION SYSTEM, LOW TEMPERATURE. Systems for maintaining food product in a frozen state in refrigeration applications.
REFRIGERATION SYSTEM, MEDIUM TEMPERATURE. Systems for maintaining food product above freezing in refrigeration applications.
REGISTERED DESIGN PROFESSIONAL. An individual who is registered or licensed to practice their respective design profession as defined by the statutory requirements of the professional registration laws of the state or jurisdiction in which the project is to be constructed.
REPAIR. The reconstruction or renewal of any part of an existing building.
REPLACEMENT AIR. Outdoor air that is used to replace air removed from a building through an exhaust system. Replacement air may be derived from one or more of the following: Make-up air, supply air, transfer air and infiltration. However, the ultimate source of all replacement air is outdoor air. When replacement air exceeds exhaust, the result is exfiltration.
REROOFING. The process of recovering or replacing an existing roof covering. See "Roof Recover" and "Roof Replacement."
RESIDENTIAL BUILDING. For this code, includes detached one- and two-family dwellings and multiple single-family dwellings (townhouses) as well as Group R-2 and R-3 buildings three stories or less in height above grade plane.
ROOF ASSEMBLY. A system designed to provide weather protection and resistance to design loads. The system consists of a roof covering and roof deck or a single component serving as both the roof covering and the roof deck. A roof assembly includes the roof covering, underlayment, roof deck, insulation, vapor retarder and interior finish. See also attic and other roofs, metal building roof, roof with insulation entirely above deck and single-rafter roof.
ROOF RECOVER. The process of installing an additional roof covering over a prepared existing roof covering without removing the existing roof covering.
ROOF REPAIR. Reconstruction or renewal of any part of an existing roof for the purposes of its maintenance.
ROOF REPLACEMENT. The process of removing the existing roof covering, repairing any damaged substrate and installing a new roof covering.
ROOFTOP MONITOR. A raised section of a roof containing vertical fenestration along one or more sides.
R-VALUE (THERMAL RESISTANCE). The inverse of the time rate of heat flow through a body from one of its bounding surfaces to the other surface for a unit temperature difference between the two surfaces, under steady state conditions, per unit area (h • ft2 • °F/Btu) [(m2 • K)/W].
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20218, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20218, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-054, § 51-11C-20218, filed 11/25/14, effective 5/1/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20218, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-20219

Section C202.19S.

SATURATED-CONDENSING TEMPERATURE. The saturation temperature corresponding to the measured refrigerant pressure at the condenser inlet for single component and azeotropic refrigerants, and the arithmetic average of the dew point and bubble point temperatures corresponding to the refrigerant pressure at the condenser entrance for zeotropic refrigerants.
SEMI-HEATED SPACE. An enclosed space within a building, including adjacent connected spaces separated by an uninsulated component (e.g., basements, utility rooms, garages, corridors), which:
1. Is heated but not cooled, and has an installed heating system output capacity greater than or equal to 3.4 Btu/(h-ft2) but not greater than 8 Btu/(h-ft2);
2. Is not a walk-in or warehouse cooler or freezer space.
SENSIBLE RECOVERY EFFECTIVENESS. Change in the dry-bulb temperature of the outdoor air supply divided by the difference between the outdoor air and return air dry-bulb temperatures, expressed as a percentage, governed by AHRI Standard 1060.
SERVICE WATER HEATING. Heating water for domestic or commercial purposes other than space heating and process requirements.
SIDELIT. See Section C405.2.4.2.
SINGLE-RAFTER ROOF. A roof where the roof above and the ceiling below are both attached to the same wood rafter and where insulation is located in the space between these wood rafters.
SKYLIGHT. See "Fenestration."
SLAB BELOW GRADE. Any portion of a slab floor in contact with the ground which is more than 24 inches below the final elevation of the nearest exterior grade.
SLAB-ON-GRADE FLOOR. That portion of a slab floor of the building envelope that is in contact with the ground and that is either above grade or is less than or equal to 24 inches below the final elevation of the nearest exterior grade.
SLEEPING UNIT. A room or space in which people sleep, which can also include permanent provisions for living, eating, and either sanitation or kitchen facilities but not both. Such rooms and spaces that are also part of a dwelling unit are not sleeping units.
SMALL ELECTRIC MOTOR. A general purpose, alternating current, single speed induction motor.
SMALL BUSINESS. Any business entity (including a sole proprietorship, corporation, partnership or other legal entity) which is owned and operated independently from all other businesses, which has the purpose of making a profit, and which has fifty or fewer employees.
SOLAR HEAT GAIN COEFFICIENT (SHGC). The ratio of the solar heat gain entering the space through the fenestration assembly to the incident solar radiation. Solar heat gain includes directly transmitted solar heat and absorbed solar radiation which is then reradiated, conducted or convected into the space.
SPACE CONDITIONING CATEGORY. Categories are based on the allowed peak space conditioning output capacity per square foot of conditioned floor area, or the design set point temperature, for a building or space. Space conditioning categories include: Low energy, semi-heated, conditioned, refrigerated walk-in and warehouse coolers, and refrigerated walk-in and warehouse freezers.
STANDARD REFERENCE DESIGN. A version of the proposed design that meets the minimum requirements of this code and is used to determine the maximum annual energy use requirement and carbon emissions from energy consumption for compliance based on total building performance and HVAC total system performance ratio.
STEEL-FRAMED WALL. A wall with a cavity (insulated or otherwise) whose exterior surfaces are separated by steel framing members (i.e., typical steel stud walls and curtain wall systems).
STOREFRONT. A system of doors and windows mulled as a composite fenestration structure that has been designed to resist heavy use. Storefront systems include, but are not limited to, exterior fenestration systems that span from the floor level or above to the ceiling of the same story on commercial buildings, with or without mulled windows and doors.
SUBSYSTEM METER. A meter placed downstream of the energy supply meter that measures the energy delivered to a load or a group of loads.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20219, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20219, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20219, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20220

Section C202.20T.

TEMPORARY GROWING STRUCTURE. A temporary growing structure has sides and roof covered with polyethylene, polyvinyl or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. Temporary structures are those that are erected for a period of less than 180 days.
THERMOSTAT. An automatic control device used to maintain temperature at a fixed or adjustable set point.
TIME SWITCH CONTROL. An automatic control device or system that controls lighting or other loads, including switching off, based on time schedules.
TOPLIT. See Section C405.2.4.3.
TUBULAR DAYLIGHTING DEVICE (TDD). A nonoperable skylight device primarily designed to transmit daylight from a roof surface to an interior ceiling surface via a tubular conduit. The device consists of an exterior glazed weathering surface, a light transmitting tube with a reflective inside surface and an interior sealing device, such as a translucent ceiling panel.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20220, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20220, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20220, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20221

Section C202.21U.

U-FACTOR (THERMAL TRANSMITTANCE). The coefficient of heat transmission (air to air) through a building component or assembly, equal to the time rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films (Btu/h • ft2 • °F) [W/(m2 • K)].
UNHEATED SLAB-ON-GRADE FLOOR. A slab-on-grade floor that is not a heated slab-on-grade floor.
UNIFORM ILLUMINATION. A quality of illumination delivered by a lighting system typically comprised of similar fixtures mounted at a regular spacing interval. This lighting system provides a uniform contrast ratio of no greater than 5:1 maximum-to-minimum ratio throughout the entire area served, including task areas.
[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20221, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20221, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-20222

Section C202.22V.

VARIABLE REFRIGERANT FLOW SYSTEM. An engineered direct-expansion (DX) refrigerant system that incorporates a common condensing unit, at least one variable capacity compressor, a distributed refrigerant piping network to multiple indoor fan heating and cooling units each capable of individual zone temperature control, through integral zone temperature control devices and a common communications network. Variable refrigerant flow utilizes three or more steps of control on common interconnecting piping.
VENTILATION. The natural or mechanical process of supplying conditioned or unconditioned air to, or removing such air from, any space.
VENTILATION AIR. That portion of supply air that comes from outside (outdoors) plus any recirculated air that has been treated to maintain the desired quality of air within a designated space.
VERTICAL FENESTRATION. See "FENESTRATION."
VISIBLE TRANSMITTANCE [VT]. The ratio of visible light entering the space through the fenestration product assembly to the incident visible light, visible transmittance, includes the effects of glazing material and frame and is expressed as a number between 0 and 1. For skylights, VT shall be measured and rated in accordance with NFRC 202.
VISIBLE TRANSMITTANCE - ANNUAL [VT-ANNUAL]. The ratio of visible light entering the space through the fenestration product assembly to the incident visible light during the course of a year, visible transmittance, which includes the effects of glazing material, frame, and light well or tubular conduit, and is expressed as a number between 0 and 1. For tubular daylighting devices, VT-annual shall be measured and rated in accordance with NFRC 203.
VOLTAGE DROP. A decrease in voltage caused by losses in the wiring system that connect the power source to the load.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20222, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20222, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20222, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-20223

Section C202.23W.

WALK-IN COOLER. An enclosed storage space capable of being refrigerated to temperatures above 32°F (0°C) and less than 55°F (12.8°C) that can be walked into, has a ceiling height of not less than 7 feet (2134 mm) and has a total chilled storage area of less than 3,000 square feet (279 m2).
WALK-IN FREEZER. An enclosed storage space capable of being refrigerated to temperatures at or below 32°F (0°C) that can be walked into, has a ceiling height of not less than 7 feet (2134 mm) and has a total chilled storage area of less than 3,000 square feet (279 m2).
WALL. That portion of the building envelope, including opaque area and fenestration, that is vertical or tilted at an angle of 60 degrees from horizontal or greater. This includes above-grade walls and below-grade walls, between floor spandrels, peripheral edges of floors, and foundation walls.
WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system.
WOOD-FRAMED AND OTHER WALLS. All other wall types, including wood stud walls.
[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20223, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20223, filed 2/1/13, effective 7/1/13.]



PDF51-11C-20224

Section C202.24—X, Y, Z.

zone. A space or group of spaces within a building with heating or cooling requirements that are sufficiently similar so that desired conditions can be maintained throughout using a single controlling device.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20224, filed 2/1/13, effective 7/1/13.]



PDF51-11C-30000

Chapter 3 [CE]—General requirements.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30000, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-30100

Section C301—Climate zones.

C301.1 General. Climate zones from Table C301.1 shall be used in determining the applicable requirements from Chapter 4.
Table C301.1
Climate Zones and Moisture Regimes
Designations by State and County
Key: A - Moist, B - Dry, C - Marine. Absence of moisture designation indicates moisture regime is irrelevant.
WASHINGTON
5B Adams
4C Grays Harbor
4C Pierce
5B Asotin
4C Island
4C San Juan
5B Benton
4C Jefferson
4C Skagit
5B Chelan
4C King
5B Skamania
4C Clallam
4C Kitsap
4C Snohomish
4C Clark
5B Kittitas
5B Spokane
5B Columbia
5B Klickitat
5B Stevens
4C Cowlitz
4C Lewis
4C Thurston
5B Douglas
5B Lincoln
4C Wahkiakum
5B Ferry
4C Mason
5B Walla Walla
5B Franklin
5B Okanogan
4C Whatcom
5B Garfield
4C Pacific
5B Whitman
5B Grant
5B Pend Oreille
5B Yakima
[Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-30100, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30100, filed 2/1/13, effective 7/1/13.]



PDF51-11C-30200

Section C302—Design conditions.

C302.1 Interior design conditions. The interior design temperatures used for heating and cooling load calculations shall be a maximum of 72°F (22°C) for heating and minimum of 75°F (24°C) for cooling.
C302.2 Exterior design conditions. The heating or cooling outdoor design temperatures shall be selected from Appendix C.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30200, filed 2/1/13, effective 7/1/13.]



PDF51-11C-30300

Section C303—Materials, systems and equipment.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30300, filed 2/1/13, effective 7/1/13.]



PDF51-11C-30310

Section 303.1Identification.

C303.1 Identification. Materials, systems and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code.
C303.1.1 Building thermal envelope insulation. An R-value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches (305 mm) or greater in width. Alternately, the insulation installers shall provide a certification listing the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For sprayed polyurethane foam (SPF) insulation, the installed thickness of the areas covered and R-value of installed thickness shall be listed on the certification. For insulated siding, the R-value shall be labeled on the product's package and shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.
EXCEPTION:
For roof insulation installed above the deck, the R-value shall be labeled as required by the material standards specified in Table 1508.2 of the International Building Code.
C303.1.1.1 Blown or sprayed roof/ceiling insulation. The thickness of blown-in or sprayed fiberglass and cellulose roof/ceiling insulation shall be written in inches (mm) on markers for every 300 square feet (28 m2) of attic area throughout the attic space. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers of not less than 1 inch (25 mm) in height. Each marker shall face the attic access opening. Spray polyurethane foam thickness and installed R-value shall be listed on certification provided by the insulation installer.
C303.1.2 Insulation mark installation. Insulating materials shall be installed such that the manufacturer's R-value mark is readily observable upon inspection.
C303.1.3 Fenestration product rating.U-factors of fenestration shall be determined as follows:
1. For windows, doors and skylights, U-factor ratings shall be determined in accordance with NFRC 100.
2. Where required for garage doors and rolling doors, U-factor ratings shall be determined in accordance with either NFRC 100 or ANSI/DASMA 105.
U-factors shall be determined by an accredited, independent laboratory, and labeled and certified by the manufacturer.
Products lacking such a labeled U-factor shall be assigned a default U-factor from Table C303.1.3(1), C303.1.3(2) or C303.1.3(4). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table C303.1.3(3).
EXCEPTION:
Units without NFRC ratings produced by a small business may be assigned default U-factors from Table C303.1.3(5) for vertical fenestration.
C303.1.4 Insulation product rating. The thermal resistance (R-value) of insulation shall be determined in accordance with the U.S. Federal Trade Commission R-value rule (C.F.R. Title 16, Part 460) in units of h x ft2 x °F/Btu at a mean temperature of 75°F (24°C).
C303.1.4.1 Insulated siding. The thermal resistance (R-Value) shall be determined in accordance with ASTM C1363. Installation for testing shall be in accordance with the manufacturer's installation instructions.
C303.1.5 Spandrel panels in glass curtain walls. Table C303.1.5 provides default U-factors for the spandrel section of glass and other curtain wall systems. Design factors that affect performance are the type of framing, the type of spandrel panel and the R-value of insulation. Four framing conditions are considered in the table. The first is the common case where standard aluminum mullions are used. Standard mullions provide a thermal bridge through the insulation, reducing its effectiveness. The second case is for metal framing members that have a thermal break. A thermal break frame uses a urethane or other nonmetallic element to separate the metal exposed to outside conditions from the metal that is exposed to interior conditions. The third case is for structural glazing or systems where there are no exposed mullions on the exterior. The fourth case is for the condition where there is no framing or the insulation is continuous and uninterrupted by framing. The columns in the table can be used for any specified level of insulation between framing members installed in framed curtain walls or spandrel panels.
C303.1.5.1 Window wall application. Where "window wall" or similar assembly that is discontinuous at intermediate slab edges is used, the slab edge U-value shall be as listed in Appendix Table A103.3.7.1(3) or as determined using an approved calculation.
C303.1.5.2 Table value assumptions. In addition to the spandrel panel assembly, the construction assembly U-factors assume an air gap between the spandrel panel (with an R-value of 1.39) and one layer of 5/8-inch gypsum board (with an R-value of 0.56) that provides the interior finish. The gypsum board is assumed to span between the window sill and a channel at the floor. For assemblies that differ from these assumptions, custom U-factors can be calculated to account for any amount of continuous insulation or for unusual construction assemblies using Equations 3-1, 3-2 or 3-3 where appropriate. Spandrel panel U-factors for assemblies other than those covered by Table C303.1.5 or Equations 3-1 through 3-3 may be determined using an alternate approved methodology. Equations 3-1 through 3-3 do not calculate the value of any insulation inboard of the curtain wall assembly.
Aluminum without Thermal Break
(Equation 3-1)
Aluminum with Thermal Break
(Equation 3-2)
Structural Glazing
(Equation 3-3)
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-30310, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-30310, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30310, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-303131

Table C303.1.3(1)Default glazed window, glass door and skylight U-factors.

Table C303.1.3(1)
Default Glazed Window, Glass Door and Skylight U-Factors
 
Window and Glass Door
 
FRAME TYPE
SINGLE PANE
DOUBLE PANE
SKY-LIGHT
Metal
1.20
0.80
 
Metal with Thermal Break
1.10
0.65
See Table
C303.1.3(4)
Nonmetal or Metal Clad
0.95
0.55
 
Glazed Block
0.60
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-303131, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-303131, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303131, filed 2/1/13, effective 7/1/13.]



PDF51-11C-303132

Table C303.1.3(2)Default door U-factors.

Table C303.1.3(2)
Default Opaque Door U-Factors
See Appendix A, Section A107
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-303132, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303132, filed 2/1/13, effective 7/1/13.]



PDF51-11C-303133

Table C303.1.3(3)Default glazed fenestration SHGC and VT.

Table C303.1.3(3)
Default Glazed Fenestration SHGC and VT
 
SINGLE GLAZED
DOUBLE GLAZED
GLAZE BLOCK
 
Clear
Tinted
Clear
Tinted
SHGC
0.40
0.40
0.40
0.40
0.40
VT
0.6
0.3
0.6
0.3
0.6
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303133, filed 2/1/13, effective 7/1/13.]



PDF51-11C-303134

Table C303.1.3(4)Default U-factors for skylights.

Table C303.1.3(4)
Default U-Factors for Skylights
 
Frame Type
 
Aluminum
Without Thermal Break
Aluminum With Thermal Break
Reinforced Vinyl/Aluminum-
Clad Wood or Vinyl
Wood or Vinyl-Clad Wood/Vinyl Without Reinforcing
Fenestration Type
Single Glazing
 
 
 
 
 
glass
U-1.58
U-1.51
U-1.40
U-1.18
 
acrylic/polycarb
U-1.52
U-1.45
U-1.34
U-1.11
Double Glazing
 
 
 
 
 
air
U-1.05
U-0.89
U-0.84
U-0.67
 
argon
U-1.02
U-0.86
U-0.80
U-0.64
Double Glazing, e = 0.20
 
 
 
 
 
air
U-0.96
U-0.80
U-0.75
U-0.59
 
argon
U-0.91
U-0.75
U-0.70
U-0.54
Double Glazing, e = 0.10
 
 
 
 
 
air
U-0.94
U-0.79
U-0.74
U-0.58
 
argon
U-0.89
U-0.73
U-0.68
U-0.52
Double Glazing, e = 0.05
 
 
 
 
 
air
U-0.93
U-0.78
U-0.73
U-0.56
 
argon
U-0.87
U-0.71
U-0.66
U-0.50
Triple Glazing
 
 
 
 
 
air
U-0.90
U-0.70
U-0.67
U-0.51
 
argon
U-0.87
U-0.69
U-0.64
U-0.48
Triple Glazing, e = 0.20
 
 
 
 
 
air
U-0.86
U-0.68
U-0.63
U-0.47
 
argon
U-0.82
U-0.63
U-0.59
U-0.43
Triple Glazing, e = 0.20 on 2 surfaces
 
 
 
 
 
air
U-0.82
U-0.64
U-0.60
U-0.44
 
argon
U-0.79
U-0.60
U-0.56
U-0.40
Triple Glazing, e = 0.10 on 2 surfaces
 
 
 
 
 
air
U-0.81
U-0.62
U-0.58
U-0.42
 
argon
U-0.77
U-0.58
U-0.54
U-0.38
Quadruple Glazing, e = 0.10 on 2 surfaces
 
 
 
 
 
air
U-0.78
U-0.59
U-0.55
U-0.39
 
argon
U-0.74
U-0.56
U-0.52
U-0.36
 
krypton
U-0.70
U-0.52
U-0.48
U-0.32
1
U-factors are applicable to both glass and plastic, flat and domed units, all spacers and gaps.
2
Emissivities shall be less than or equal to the value specified.
3
Gap fill shall be assumed to be air unless there is a minimum of 90 percent argon or krypton.
4
Aluminum frame with thermal break is as defined in footnote 1 to Table C303.1.3(5).
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303134, filed 2/1/13, effective 7/1/13.]



PDF51-11C-303135

Table C303.1.3(5)Small business compliance default table.

Table C303.1.3(5)
Small Business Compliance Table
Default U-Factors for Vertical Glazing
Vertical Glazing Description
Frame Type
Any Frame
Aluminum Thermal Break2
Wood/Vinyl/
Fiberglass
Panes
Low-e1
Spacer
Fill
Double3
A
Any
Argon
0.48
0.41
0.32
 
B
Any
Argon
0.46
0.39
0.30
 
C
Any
Argon
0.44
0.37
0.28
 
C
High
Performance
Argon
0.42
0.35
Deemed to
comply5
Triple4
A
Any
Air
0.50
0.44
0.26
 
B
Any
Air
0.45
0.39
0.22
 
C
Any
Air
0.41
0.34
0.20
 
Any double low-e
Any
Air
0.35
0.32
0.18
1
Low-eA (emissivity) shall be 0.24 to 0.16.
 
Low-eB (emissivity) shall be 0.15 to 0.08.
 
Low-eC (emissivity) shall be 0.07 or less.
2
Aluminum Thermal Break = An aluminum thermal break framed window shall incorporate the following minimum design characteristics:
a)
The thermal conductivity of the thermal break material shall be not more than 3.6 Btu-in/h/ft2/°F;
b)
The thermal break material must produce a gap in the frame material of not less than 0.210 inches; and
c)
All metal framing members of the products exposed to interior and exterior air shall incorporate a thermal break meeting the criteria in a) and b) above.
3
A minimum air space of 0.375 inches between panes of glass is required for double glazing.
4
A minimum air space of 0.25 inches between panes of glass is required for triple glazing.
5
Deemed to comply glazing shall not be used for performance compliance.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303135, filed 2/1/13, effective 7/1/13.]



PDF51-11C-30315

Table C303.1.5U-factors for spandrel panels and glass curtain walls.

Table C303.1.5
U-Factors for Spandrel Panels and Glass Curtain Walls
 
 
Rated R-Value of Insulation Between Framing Members
None
R-4
R-7
R-10
R-15
R-20
R-25
R-30
Frame Type
Spandrel Panel
 
A
B
C
D
E
F
G
H
Aluminum without Thermal Break
Single glass pane, stone or metal panel
1
0.360
0.242
0.222
0.212
0.203
0.198
0.195
0.193
Double glass with no low-e coatings
2
0.297
0.233
0.218
0.209
0.202
0.197
0.194
0.192
Triple or low-e glass
3
0.267
0.226
0.214
0.207
0.200
0.196
0.194
0.192
Aluminum with Thermal Break
Single glass pane, stone or metal panel
4
0.350
0.211
0.186
0.173
0.162
0.155
0.151
0.149
Double glass with no low-e coatings
5
0.278
0.200
0.180
0.170
0.160
0.154
0.151
0.148
Triple or low-e glass
6
0.241
0.191
0.176
0.167
0.159
0.153
0.150
0.148
Structural Glazing
Single glass pane, stone or metal panel
7
0.354
0.195
0.163
0.147
0.132
0.123
0.118
0.114
Double glass with no low-e coatings
8
0.274
0.180
0.156
0.142
0.129
0.122
0.117
0.114
Triple or low-e glass
9
0.231
0.169
0.150
0.138
0.127
0.121
0.116
0.113
No Framing, or Insulation is Continuous
Single glass pane, stone or metal panel
10
0.360
0.148
0.102
0.078
0.056
0.044
0.036
0.031
Double glass with no low-e coatings
11
0.297
0.136
0.097
0.075
0.054
0.043
0.035
0.030
Triple or low-e glass
12
0.267
0.129
0.093
0.073
0.053
0.042
0.035
0.030
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-30315, filed 11/26/19, effective 7/1/20.]



PDF51-11C-30320

Section C303.2Installation.

C303.2 Installation. Materials, systems and equipment shall be installed in accordance with the manufacturer's instructions and the International Building Code.
C303.2.1 Protection of exposed foundation insulation. Insulation applied to the exterior of basement walls, crawlspace walls and the perimeter of slab-on-grade floors shall have a rigid, opaque and weather-resistant protective covering to prevent the degradation of the insulation's thermal performance. The protective covering shall cover the exposed exterior insulation and extend not less than 6 inches (153 mm) below grade.
C303.2.2 Multiple layers of continuous insulation. Where two or more layers of continuous insulation board are used in a construction assembly, the continuous insulation boards shall be installed in accordance with Section C303.2. Where the continuous insulation board manufacturer's instructions do not address installation of two or more layers, the edge joints between each layer of continuous insulation boards shall be staggered.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-30320, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-30320, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30320, filed 2/1/13, effective 7/1/13.]



PDF51-11C-30330

Reserved.

[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-30330, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30330, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40000

Chapter 4 [CE]—Commercial energy efficiency.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40000, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-40100

Section C401General.

C401.1 Scope. The provisions in this chapter are applicable to commercial buildings and their building sites.
C401.2 Application. Commercial buildings shall comply with one of the following:
1. The requirements of Sections C402, C403, C404, C405, C406, C408, C409, C410, and C411.
2. The requirements of Section C407.
3. When adopted by the local jurisdiction, the requirements of Appendix F, Outcome-Based Energy Budget, Sections C408, C409, C410, C411 and any specific sections in Table C407.2 as determined by the local jurisdiction. The Proposed Total UA of the proposed building shall be no more than 20 percent higher than the Allowed Total UA as defined in Section C402.1.5.
C401.2.1 Application to existing buildings. Work on existing buildings shall comply with Chapter 5 in addition to the applicable provisions of Chapter 4.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40100, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40100, filed 12/6/16, effective 5/1/17; WSR 16-13-089, § 51-11C-40100, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40100, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40100, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40200

Section C402—Building envelope requirements.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40200, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40210

Section C402.1General (Prescriptive).

C402.1 General. Building thermal envelope assemblies for buildings that are intended to comply with the code on a prescriptive basis, in accordance with the compliance path described in Item 1 of Section C401.2, shall comply with the following:
1. The opaque portions of the building thermal envelope shall comply with the specific insulation requirements of Section C402.2 and the thermal requirements of either the R-value based method of Section C402.1.3, the U-, C- and F-factor based method of Section C402.1.4, or the component performance alternative of Section C402.1.5.
2. Fenestration in building envelope assemblies shall comply with Section C402.4, or the component performance alternative of Section C402.1.5.
3. Air leakage of building envelope assemblies shall comply with Section C402.5.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40210, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40210, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40210, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40210, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40211

Section C402.1.1Low energy buildings.

C402.1.1Low energy buildings, semi-heated buildings and greenhouses. Low energy buildings shall comply with Section C402.1.1.1. Semi-heated buildings and spaces shall comply with Section C402.1.1.2. Greenhouses shall comply with Section C402.1.1.3.
C402.1.1.1 Low energy buildings. The following buildings, or portions thereof, separated from the remainder of the building by building thermal envelope assemblies complying with this code shall be exempt from all thermal envelope provision of this code:
1. Those that are heated and/or cooled with a peak design rate of energy usage less than 3.4 Btu/h × ft2 (10.7 W/m2) or 1.0 watt/ft2 (10.7 W/m2) of floor area for space conditioning purposes.
2. Those that do not contain conditioned space.
3. Unstaffed equipment shelters or cabinets used solely for personal wireless service facilities.
C402.1.1.2 Semi-heated buildings and spaces. The building envelope of semi-heated buildings, or portions thereof, shall comply with the same requirements as that for conditioned spaces in Section C402, except as modified by this section. The total installed output capacity of mechanical space conditioning systems serving a semi-heated building or space shall comply with Section C202. Building envelope assemblies separating conditioned space from semi-heated space shall comply with exterior envelope insulation requirements. Semi-heated spaces heated by mechanical systems that do not include electric resistance heating equipment are not required to comply with the opaque wall insulation provisions of Section C402.2.3 for walls that separate semi-heated spaces from the exterior or low energy spaces. Semi-heated spaces shall be calculated separately from other conditioned spaces for compliance purposes. Opaque walls in semi-heated spaces shall be calculated as fully code compliant opaque walls for both the target and proposed for the Target UA calculations for Component Performance compliance per Section C402.1.5, and for the Standard Reference Design for Total Building Performance compliance per Section C407. The capacity of heat trace temperature maintenance systems complying with Section C404.7.2 that are provided for freeze protection of piping and equipment only shall not be included in the total installed output capacity of mechanical space conditioning systems.
EXCEPTION:
Building or space may comply as semi-heated when served by one or more of the following system alternatives:
 
1. Electric infrared heating equipment for localized heating applications.
 
2. Heat pumps with cooling capacity permanently disabled, as preapproved by the jurisdiction.
C402.1.1.3 Greenhouses.Greenhouse structures or areas that comply with all of the following shall be exempt from the building envelope requirements of this code:
1. Exterior opaque envelope assemblies comply with Sections C402.2 and C402.4.4.
EXCEPTION:
Low energy greenhouses that comply with Section C402.1.1.1.
2. Interior partition building thermal envelope assemblies that separate the greenhouse from conditioned space complying with Sections C402.2, C402.4.3 and C402.4.4.
3. Nonopaque envelope assemblies complying with the thermal envelope requirements in Table C402.1.1.3. The U-factor for the nonopaque roof shall be for the roof assembly or a roof that includes the assembly and an internal curtain system.
EXCEPTION:
Unheated greenhouses.
4. No mechanical cooling is provided.
5. For heated greenhouses, heating is provided by a radiant heating system, a condensing natural gas-fired or condensing propane-fired heating system, or a heat pump with cooling capacity permanently disabled as preapproved by the jurisdiction.
Table C402.1.1.3
Non-Opaque Thermal Envelope Maximum Requirements
Component U-Factor
BTU/h-ft2-°F
Climate Zone 5 and Marine 4
Non-opaque roof
0.5
Non-opaque SEW wall
0.7
Non-opaque N wall
0.6
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40211, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40211, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40211, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40211, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40212

Section C402.1.2Equipment buildings.

C402.1.2 Equipment buildings. Buildings that comply with all of the following shall be exempt from the building thermal envelope provisions of this code:
1. Are separate buildings with floor area no more than 500 square feet (50 m2).
2. Are intended to house electronic equipment with installed equipment power totaling at least 7 watts per square foot (75 W/m2) and not intended for human occupancy.
3. Are served by mechanical cooling and heating systems sized in accordance with Sections C403.1.2 and C403.3.1.
4. Have a heating system capacity not greater than 17,000 Btu/hr (5 kW) and a heating thermostat set point that is restricted to not more than 50°F (10°C).
5. Have an average wall and roof U-factor less than 0.200.
EXCEPTION:
Where the cooling and heating system is a heat pump, the heating capacity is allowed to exceed 17,000 Btu/h provided the heat pump cooling efficiency is at least 15 percent better than the requirements in Table C403.3.2(2).
C402.1.2.1 Standalone elevator hoistways. Elevator hoistways that comply with all of the following shall be exempt from the building thermal envelope and envelope air barrier provisions of this code:
1. Are separate from any other conditioned spaces in the building (do not serve or open into any conditioned, semi-heated or indirectly conditioned space).
2. Have heating and/or cooling equipment sized only to serve the expected elevator loads with thermostat setpoints restricted to heating to no higher than 40°F and cooling to no lower than 95°F.
3. Have an area weighted average wall, roof and floor (where applicable) U-factor of less than or equal to 0.20. Calculations must include any floor-slab-edges that penetrate the hoistway and thus are considered part of the above-grade walls.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40212, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40212, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40212, filed 2/1/13, effective 7/1/13.]



PDF51-11C-402121

Table C402.1.3Opaque thermal envelope assembly R-value requirements.

Table C402.1.3
Opaque Thermal Envelope Insulation Component
Minimum Requirements, R-value Methoda, i
CLIMATE ZONE
5 AND MARINE 4
 
All Other
Group R
Roofs
Insulation entirely above deck
R-38ci
R-38ci
Metal buildingsb
R-25 + 
R-11 LS
R-25 + 
R-11 LS
Attic and other
R-49
R-49
Walls, Above Grade
Massh
R-9.5cic
R-13.3ci
Mass transfer deck slab edge
R-5
R-5
Metal buildings
R-19ci or R-13 + 13ci
R-19ci or R-13 + 13ci
Steel framed
R-13 + 
R-10ci
R-19 + 
R-8.5ci
Wood framed and other
R-21 int or R-15 + 5ci std
R-13 + 7.5ci std or R-20 + 3.8ci std or R-25 std
Walls, Below Grade
Below-grade walld,h
Same as above grade
Same as above grade
Floors
Massf
R-30ci
R-30ci
Joist/framing
R-30e
R-30e
Slab-on-Grade Floors
Unheated slabs
R-10 for 24" below
R-10 for 24" below
Heated slabs
R-10 perimeter & under entire slab
R-10 perimeter & under entire slab
Opaque Doorsg
Nonswinging
R-4.75
R-4.75
For SI:
1 inch = 25.4 mm. ci = Continuous insulation. NR = No requirement.
LS = 
Liner systemA continuous membrane installed below the purlins and uninterrupted by framing members. Uncompressed, unfaced insulation rests on top of the membrane between the purlins.
a
Assembly descriptions can be found in Chapter 2 and Appendix A.
b
Where using R-value compliance method, a thermal spacer block with minimum thickness of 1/2-inch and minimum R-value of R-3.5 shall be provided, otherwise use the U-factor compliance method in Table C402.1.4.
c
Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following:
 
1. At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and
 
2. The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall R-value from Table C402.1.3/U-factor from Table C402.1.4.
d
Where heated slabs are below grade, they shall comply with the insulation requirements for heated slabs.
e
Steel floor joist systems shall be insulated to R-38 + R-10ci.
f
"Mass floors" shall include floors weighing not less than:
 
1. 35 pounds per square foot of floor surface area; or
 
2. 25 pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot.
g
Not applicable to garage doors. See Table C402.1.4.
h
Peripheral edges of intermediate concrete floors are included in the above-grade mass wall category and therefore must be insulated as above-grade mass walls unless they meet the definition of Mass Transfer Deck Slab Edge. The area of the peripheral edges of concrete floors shall be defined as the thickness of the slab multiplied by the perimeter length of the edge condition. See Table A103.3.7.2 for typical default U-factors for above-grade slab edges and footnote c for typical conditions of above-grade slab edges.
i
For roof, wall or floor assemblies where the proposed assembly would not be continuous insulation, an alternate nominal R-value compliance option for assemblies with isolated metal penetrations of otherwise continuous insulation is:
Assemblies with continuous
insulation (see definition)
Alternate option for assemblies with metal penetrations, greater than 0.04% but less than 0.08%
Alternate option for assemblies with metal penetrations, greater than or equal to 0.08% but less than 0.12%
R-9.5ci
R-11.9ci
R-13ci
R-11.4ci
R-14.3ci
R-15.7ci
R-13.3ci
R-16.6ci
R-18.3ci
R-15.2ci
R-19.0ci
R-21ci
R-30ci
R-38ci
R-42ci
R-38ci
R-48ci
R-53ci
R-13 + R-7.5ci
R-13 + R-9.4ci
R-13 + R-10.3ci
R-13 + R-10ci
R-13 + R-12.5ci
R-13 + R-13.8ci
R-13 + R-12.5ci
R-13 + R-15.6ci
R-13 + R-17.2ci
R-13 + R-13ci
R-13 + R-16.3ci
R-13 + R-17.9ci
R-19 + R-8.5ci
R-19 + R-10.6ci
R-19 + R-11.7ci
R-19 + R-14ci
R-19 + R-17.5ci
R-19 + R-19.2ci
R-19 + R-16ci
R-19 + R-20ci
R-19 + R-22ci
R-20 + R-3.8ci
R-20 + R-4.8ci
R-20 + R-5.3ci
R-21 + R-5ci
R-21 + R-6.3ci
R-21 + R-6.9ci
This alternate nominal R-value compliance option is allowed for projects complying with all of the following:
1.
The ratio of the cross-sectional area, as measured in the plane of the surface, of metal penetrations of otherwise continuous insulation to the opaque surface area of the assembly is greater than 0.0004 (0.04%), but less than 0.0012 (0.12%).
2.
The metal penetrations of otherwise continuous insulation are isolated or discontinuous (e.g., brick ties or other discontinuous metal attachments, offset brackets supporting shelf angles that allow insulation to go between the shelf angle and the primary portions of the wall structure). No continuous metal elements (e.g., metal studs, z-girts, z-channels, shelf angles) penetrate the otherwise continuous portion of the insulation.
3.
Building permit drawings shall contain details showing the locations and dimensions of all the metal penetrations (e.g., brick ties or other discontinuous metal attachments, offset brackets, etc.) of otherwise continuous insulation. In addition, calculations shall be provided showing the ratio of the cross-sectional area of metal penetrations of otherwise continuous insulation to the overall opaque wall area.
For other cases where the proposed assembly is not continuous insulation, see Section C402.1.4 for determination of U-factors for assemblies that include metal other than screws and nails.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-402121, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-402121, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402121, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402121, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40213

Section C402.1.3Insulation component R-value method.

C402.1.3 Insulation component R-value-based method.Building thermal envelope opaque assemblies shall comply with the requirements of Section C402.2 based on the climate zone specified in Chapter 3. For opaque portions of the building thermal envelope intended to comply on an insulation component R-value basis, the R-values for insulation shall not be less than that specified in Table C402.1.3. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the R-values from the "Group R" column of Table C402.1.3. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the R-values from the "All other" column of Table C402.1.3.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40213, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40213, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40213, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-40213, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40213, filed 2/1/13, effective 7/1/13.]



PDF51-11C-402131

Reserved.

[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402131, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-402131, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-402131, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402131, filed 2/1/13, effective 7/1/13.]



PDF51-11C-402132

Reserved.

[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402132, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-402132, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402132, filed 2/1/13, effective 7/1/13.]



PDF51-11C-402133

Reserved.

[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402133, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-402133, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402133, filed 2/1/13, effective 7/1/13.]



PDF51-11C-402134

Reserved.

[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402134, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-402134, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402134, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40214

Section C402.1.4Assembly U-factor, C-factor, or F-factor-based method.

C402.1.4 Assembly U-factor, C-factor, or F-factor-based method. Building thermal envelope opaque assemblies shall meet the requirements of Section C402.2 based on the climate zone specified in Chapter 3. Building thermal envelope opaque assemblies intended to comply on an assembly U-, C-, or F-factor basis shall have a U-, C-, or F-factor not greater than that specified in Table C402.1.4. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the U-, C-, or F-factor from the "Group R" column of Table C402.1.4. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the U-, C-, or F-factor from the "All other" column of Table C402.1.4. The U-factors for typical construction assemblies are included in Appendix A. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Appendix A, values shall be calculated in accordance with the ASHRAE HandbookFundamentals using the framing factors listed in Appendix A where applicable and shall include the thermal bridging effects of framing materials.
C402.1.4.1 Thermal resistance of cold-formed steel stud walls.U-factors of walls with cold-formed steel studs shall be permitted to be determined in accordance with Equation 4-1:
Equation 4-1:
U = 1/[Rs + (ER)]
Where:
Rs
=
The cumulative R-value of the wall components along the path of heat transfer, excluding the cavity insulation and steel studs.
ER
=
The effective R-value of the cavity insulation with steel studs.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40214, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40214, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40214, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40214, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-402141

Table C402.1.4Opaque thermal envelope requirements, U-factor method.

Table C402.1.4
Opaque Thermal Envelope Requirementsa,f
CLIMATE ZONE
5 AND MARINE 4
 
All Other
Group R
Roofs
Insulation entirely above deck
U-0.027
U-0.027
Metal buildings
U-0.031
U-0.031
Attic and other
U-0.021
U-0.021
Joist or single rafter
U-0.027
U-0.027
Walls, Above Grade
Massg
U-0.104d
U-0.078
Mass transfer deck slab edge
U-0.20
U-0.20
Metal building
U-0.052
U-0.052
Steel framed
U-0.055
U-0.055
Wood framed and other
U-0.054
U-0.051
Walls, Below Grade
Below-grade wallb, g
Same as above grade
Same as above grade
Floors
Masse
U-0.031
U-0.031
Joist/framing
U-0.029
U-0.029
Slab-on-Grade Floors
Unheated slabs
F-0.54
F-0.54
Heated slabsc
F-0.55
F-0.55
Opaque Doors
Swinging door
U-0.37
U-0.37
Nonswinging door
U-0.34
U-0.34
Garage door <14% glazing
U-0.31
U-0.31
a
Use of opaque assembly U-factors, C-factors, and F-factors from Appendix A is required unless otherwise allowed by Section C402.1.4.
b
Where heated slabs are below grade, they shall comply with the F-factor requirements for heated slabs.
c
Heated slab F-factors shall be determined specifically for heated slabs. Unheated slab factors shall not be used.
d
Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following:
 
1. At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and
 
2. The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall R-value from Table C402.1.3/U-factor from Table C402.1.4.
e
"Mass floors" shall include floors weighing not less than:
1. 35 pounds per square foot of floor surface area; or
2. 25 pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot.
f
Opaque assembly U-factors based on designs tested in accordance with ASTM C1363 shall be permitted. The R-value of continuous insulation shall be permitted to be added or substracted from the original test design.
g
Peripheral edges of intermediate concrete floors are included in the above-grade mass wall category and therefore must be insulated as above-grade mass walls unless they meet the definition of Mass Transfer Deck Slab Edge. The area of the peripheral edges of concrete floors shall be defined as the thickness of the slab multiplied by the perimeter length of the edge condition. See Table A103.3.7.2 for typical default U-factors for above-grade slab edges and footnote c for typical conditions of above-grade slab edges.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-402141, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-402141, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402141, filed 1/19/16, effective 7/1/16.]



PDF51-11C-402142

Table C402.1.4.1Effective R-values for steel stud wall assemblies.

Table C402.1.4.1
Effective R-values For Steel Stud Wall Assemblies
NOMINAL STUD DEPTH (inches)
SPACING OF FRAMING (inches)
CAVITYR-VALUE
(insulation)
CORRECTION FACTOR (Fc)
EFFECTIVE
R-VALUE (ER)
(Cavity R-Value x Fc)
 
3 1/2
16
13
0.46
5.98
 
15
0.43
6.45
 
3 1/2
24
13
0.55
7.15
 
15
0.52
7.80
 
6
16
19
0.37
7.03
 
21
0.35
7.35
 
6
24
19
0.45
8.55
 
21
0.43
9.03
 
8
16
25
0.31
7.75
 
24
25
0.38
9.50
[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402142, filed 1/19/16, effective 7/1/16.]



PDF51-11C-40215

Section C402.1.5Component performance alternative.

C402.1.5 Component performance alternative. Building envelope values and fenestration areas determined in accordance with Equation 4-2 shall be permitted in lieu of compliance with the U-factors and F-factors in Table C402.1.4 and C402.4 and the maximum allowable fenestration areas in Section C402.4.1.
For buildings with more than one space conditioning category, component performance compliance shall be demonstrated separately for each space conditioning category. Interior partition ceilings, walls, fenestration and floors that separate space conditioning areas shall be applied to the component performance calculations for the space conditioning category with the highest level of space conditioning.
Equation 4-2
Proposed Total UA Allowable Total UA
Where:
 
 
Proposed Total UA
=
UA-glaz-prop + UA sky-prop + UA-opaque-prop + FL-slab-prop
Allowable Total UA
=
UA-glaz-allow + UA-glaz-excess + UA sky-allow + UA-sky-excess + UA-opaque-allow + FL-slab-allow
UA-glaz-prop
=
Sum of (proposed U-value x proposed area) for each distinct vertical fenestration type, up to code maximum area
UA-sky-prop
=
Sum of (proposed U-value x proposed area) for each distinct skylight type, up to the code maximum area
UA-opaque-prop
=
Sum of (proposed U-value x proposed area) for each distinct opaque thermal envelope type
FL-slab-prop
=
Sum of (proposed F-value x proposed length) for each distinct slab on grade perimeter assembly
UA-glaz-allow
=
Sum of (code maximum vertical fenestration U-value from Table C402.4, or Section C402.4.1.1.2 if applicable, x proposed area) for each distinct vertical fenestration type, not to exceed the code maximum area1
UA-glaz-excess
=
U-value for the proposed wall type from Table C402.42 x vertical fenestration area in excess of the code maximum area
UA-sky-allow
=
Sum of (code maximum skylight U-value from Table C402.4 x proposed area) for each distinct skylight type proposed, not to exceed the code maximum area
UA-sky-excess
=
U-value for the proposed roof type from Table C402.43 x skylight area in excess of the code maximum area
UA-opaque-allow
=
Code maximum opaque envelope U-value from Table C402.1.4 for each opaque door, wall, roof, and floor assembly x proposed area
FL-slab-allow
=
Code maximum F-value for each slab-on-grade perimeter assembly x proposed length
Notes:
1 Where multiple vertical fenestration types are proposed and the code maximum area is exceeded, the U-value shall be the average Table C402.1.4 U-value weighted by the proposed vertical fenestration area of each type.
 
2 Where multiple wall types are proposed the U-value shall be the average Table C402.1.4 U-value weighted by the proposed above grade wall area of each type.
 
3 Where multiple roof types are proposed the U-value shall be the average Table C402.1.4 U-value weighted by the proposed roof area of each type.
C402.1.5.1 Component U-factors. The U-factors for typical construction assemblies are included in Chapter 3 and Appendix A. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Chapter 3 or Appendix A, values shall be calculated in accordance with the ASHRAE HandbookFundamentals, using the framing factors listed in Appendix A.
For envelope assemblies containing metal framing, the U-factor shall be determined by one of the following methods:
1. Results of laboratory measurements according to acceptable methods of test.
2. ASHRAE HandbookFundamentals where the metal framing is bonded on one or both sides to a metal skin or covering.
3. The zone method as provided in ASHRAE HandbookFundamentals.
4. Effective framing/cavity R-values as provided in Appendix A.
When return air ceiling plenums are employed, the roof/ceiling assembly shall:
a. For thermal transmittance purposes, not include the ceiling proper nor the plenum space as part of the assembly; and
b. For gross area purposes, be based upon the interior face of the upper plenum surface.
5. Tables in ASHRAE 90.1 Normative Appendix A.
6. Calculation method for steel-framed walls in accordance with Section C402.1.4.1 and Table C402.1.4.1.
C402.1.5.2 SHGC rate calculations. Fenestration SHGC values for individual components and/or fenestration are permitted to exceed the SHGC values in Table C402.4 and/or the maximum allowable fenestration areas in Section C402.4.1 where the proposed values result in SHGCAp less than SHGCAt as determined by Equations 4-3 and 4-4.
Equation 4-3SHGC Rate Calculations
Proposed Total SHGCxAAllowable Total SHGCxA
Where:
 
 
Proposed Total SHGCxA
=
SHGCxA-glaz-prop + SHGCxA-sky-prop
Allowable Total SHGCxA
=
SHGCxA-glaz-allow + SHGCxA-sky-allow
SHGCxA-glaz-prop
=
Sum of (proposed SHGCx proposed area) for each distinct vertical fenestration type
SHGCxA-sky-prop
=
Sum of (proposed SHGCx proposed area) for each distinct skylight type
SHGCxA-glaz-allow
=
Sum of (code maximum vertical fenestration SHGC from Table C402.4, or Section C402.4.1.3 if applicable, x proposed area) for each distinct vertical fenestration type, not to exceed the code maximum area
SHGCxA-sky-allow
=
Sum of (code maximum skylight SHGC from Table C402.4x proposed area) for each distinct skylight type, not to exceed the code maximum area
If the proposed vertical fenestration area does not exceed the Vertical Fenestration Area allowed, the target area for each vertical fenestration type shall equal the proposed area. If the proposed vertical fenestration area exceeds the Vertical Fenestration Area allowed, the target area of each vertical fenestration element shall be reduced in the base envelope design by the same percentage and the net area of each above-grade wall type increased proportionately by the same percentage so that the total vertical fenestration area is exactly equal to the Vertical Fenestration Area allowed.
If the proposed skylight area does not exceed the Allowable Skylight Area from Section C402.4.1, the target area shall equal the proposed area. If the proposed skylight area exceeds the Allowable Skylight Area from Section C402.4.1, the area of each skylight element shall be reduced in the base envelope design by the same percentage and the net area of each roof type increased proportionately by the same percentage so that the total skylight area is exactly equal to the allowed percentage per Section C402.3.1 of the gross roof area.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40215, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27A and 19.27 RCW. WSR 19-02-089, § 51-11C-40215, filed 1/2/19, effective 7/1/19. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-40215, filed 5/2/17, effective 6/2/17; WSR 16-24-070, § 51-11C-40215, filed 12/6/16, effective 5/1/17; WSR 16-13-089, § 51-11C-40215, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40215, filed 1/19/16, effective 7/1/16.]



PDF51-11C-40220

Section C402.2Specific insulation requirements.

C402.2 Specific building thermal envelope insulation requirements. Insulation in building thermal envelope opaque assemblies shall comply with Sections C402.2.1 through C402.2.6 and Table C402.1.3.
Where this section refers to installing insulation levels as specified in Section C402.1.3, assemblies complying with Section C402.1.4 and buildings complying with Section C402.1.5 are allowed to install alternate levels of insulation so long as the U-factor of the insulated assembly is less than or equal to the U-factor required by the respective path.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40220, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40220, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40220, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40220, filed 2/1/13, effective 7/1/13.]



PDF51-11C-402200

Reserved.

[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402200, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-402200, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402200, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40221

Section C402.2.1Roof assembly.

C402.2.1Roof assembly. The minimum thermal resistance (R-value) of the insulating material installed either between the roof framing or continuously on the roof assembly shall be as specified in Table C402.1.3, based on construction materials used in the roof assembly. Continuous insulation board shall be installed in not less than 2 layers and the edge joints between each layer of insulation shall be staggered. Insulation installed on a suspended ceiling with removable ceiling tiles shall not be considered part of the minimum thermal resistance of the roof insulation.
EXCEPTIONS:
1. Continuously insulated roof assemblies where the thickness of insulation varies 1 inch (25 mm) or less and where the area-weighted U-factor is equivalent to the same assembly with the R-value specified in Table C402.1.3.
 
2. Where tapered insulation is used with insulation entirely above deck, those roof assemblies shall show compliance on a U-factor basis per Section C402.1.4. The effective U-factor shall be determined through the use of Tables A102.2.6(1), A102.2.6(2) and A102.2.6(3).
 
3. Two layers of insulation are not required where insulation tapers to the roof deck, such as at roof drains. At roof drains, the immediate 24 inch by 24 inch plan area around each roof drain has a minimum insulation requirement of R-13, but otherwise is permitted to be excluded from the roof insulation area-weighted calculations.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40221, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40221, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40221, filed 2/1/13, effective 7/1/13.]



PDF51-11C-402211

Skylight curbs.

C402.2.1.1 Skylight curbs. Skylight curbs shall be insulated to the level of roofs with insulation entirely above deck or R-5, whichever is less.
EXCEPTION:
Unit skylight curbs included as a component of a skylight listed and labeled in accordance with NFRC 100 shall not be required to be insulated.
C402.2.1.2 Rooftop HVAC equipment curbs. Structural curbs installed to support rooftop HVAC equipment are allowed to interrupt the above roof insulation. The area under the HVAC equipment inside of the equipment curb shall be insulated to a minimum of R-13 in all locations where there are not roof openings for ductwork. The annular space between the roof opening and the ductwork shall be sealed to maintain the building air barrier. The plan-view area of the HVAC equipment curb shall be excluded from the prescriptive roof insulation requirements or the area-weighted component performance calculations.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-402211, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402211, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402211, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40222

Reserved.

[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40222, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40222, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40222, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40223

Section C402.2.3Above-grade walls.

C402.2.3 Above-grade walls. The minimum thermal resistance (R-value) of materials installed in the wall cavity between the framing members and continuously on the walls shall be as specified in Table C402.1.3, based on framing type and construction materials used in the wall assembly. The R-value of integral insulation installed in concrete masonry units (CMU) shall not be used in determining compliance with Table C402.1.3 except as otherwise noted in the table. In determining compliance with Table C402.1.4, the use of the U-factor of concrete masonry units with integral insulation shall be permitted.
"Mass walls" where used as a component in the thermal envelope of a building shall comply with one of the following:
1. Weigh not less than 35 psf (170 kg/m2) of wall surface area.
2. Weigh not less than 25 psf (120 kg/m2) of wall surface area where the material weight is not more than 120 pounds per cubic foot (pcf) (1,900 kg/m3).
3. Have a heat capacity exceeding 7 Btu/ft2 x °F (144 kJ/m2 x K).
4. Have a heat capacity exceeding 5 Btu/ft2 x °F (103 kJ/m2 x K) where the material weight is not more than 120 pcf (1900 kg/m3).
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40223, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40223, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40223, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40224

Section C402.2.4Below-grade walls.

C402.2.4 Below-grade walls. The R-value of the insulating material installed in, or continuously on, the below-grade walls shall be in accordance with Table C402.1.3. The U-factor or R-value required shall extend to the level of the lowest floor of the conditioned space enclosed by the below-grade wall.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and Chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40224, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40224, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40224, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40225

Section C402.2.5Floors.

C402.2.5 Floors. The thermal properties (component R-values or assembly U- or F-factors) of floor assemblies over outdoor air or unconditioned space shall be as specified in Table C402.1.3 or C402.1.4 based on the construction materials used in the floor assembly. Floor framing cavity insulation or structural slab insulation shall be installed to maintain permanent contact with the underside of the subfloor decking or structural slabs.
"Mass floors" where used as a component of the thermal envelope of a building shall provide one of the following weights:
1. 35 pounds per square foot of floor surface area;
2. 25 pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot.
EXCEPTIONS:
1. The floor framing cavity insulation or structural slab insulation shall be permitted to be in contact with the top side of sheathing or continuous insulation installed on the bottom side of floor assemblies where combined with insulation that meets or exceeds the minimum R-value in Table C402.1.3 for "Metal framed" or "Wood framed and other" values for "Walls, Above Grade" and extends from the bottom to the top of all perimeter floor framing or floor assembly members.
 
2. Insulation applied to the underside of concrete floor slabs shall be permitted an air space of not more than 1 inch where it turns up and is in contact with the underside of the floor under walls associated with the building thermal envelope.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40225, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40225, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40225, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40225, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40226

Section C402.2.6Slab-on-grade perimeter insulation.

C402.2.6 Slabs-on-grade perimeter insulation. Where the slab-on-grade is in contact with the ground, the minimum thermal resistance (R-value) of the insulation around the perimeter of unheated or heated slab-on-grade floors designed in accordance with the R-value method of Section C402.1.3 shall be as specified in Table C402.1.3. The insulation shall be placed on the outside of the foundation or on the inside of the foundation wall. The insulation shall extend downward from the top of the slab for a minimum distance as shown in the table or to the top of the footing, whichever is less, or downward to at least the bottom of the slab and then horizontally to the interior or exterior for the total distance shown in the table. Insulation extending away from the building shall be protected by pavement or by a minimum of 10 inches (254 mm) of soil. Insulation complying with Table C402.1.3 shall be provided under the entire area of heated slabs on grade.
EXCEPTION:
Where the slab-on-grade floor is greater than 24 inches (61 mm) below the finished exterior grade, perimeter insulation is not required.
[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40226, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40226, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40227

Airspaces.

Where the thermal properties of airspaces are used to comply with this code in accordance with Section C401.2, such airspaces shall be enclosed in an unventilated cavity constructed to minimize airflow into and out of the enclosed airspace. Airflow shall be deemed minimized where the enclosed airspace is located on the interior side of the continuous air barrier and is bounded on all sides by building components.
EXCEPTION:
The thermal resistance of airspaces located on the exterior side of the continuous air barrier and adjacent to and behind the exterior wall covering material shall be determined in accordance with ASTM C1363 modified with an airflow entering the bottom and exiting the top of the airspace at a minimum air movement rate of not less than 70 mm/sec.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40227, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40227, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40227, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40228

Section C402.2.8Insulation of radiant heating systems.

C402.2.8 Insulation of radiant heating systems.Radiant heating system panels, and their associated components that are installed in interior or exterior assemblies shall be insulated to an R-value of not less than R-3.5 on all surfaces not facing the space being heated. Radiant heating system panels that are installed in the building thermal envelope shall be separated from the exterior of the building or unconditioned or exempt spaces by not less than the R-value of insulation installed in the opaque assembly in which they are installed or the assembly shall comply with Section C402.1.4.
EXCEPTION:
Heated slabs on grade insulated in accordance with Section C402.2.6.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40228, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40228, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40228, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40230

Section C402.4Fenestration.

C402.3 Reserved.
C402.4 Fenestration. Fenestration shall comply with Sections C402.4 through C402.4.4 and Table C402.4. Daylight responsive controls shall comply with this section and Section C405.2.4.1.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40230, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40230, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40230, filed 2/1/13, effective 7/1/13.]



PDF51-11C-402300

Table C402.4Building envelope requirementsFenestration.

Table C402.4
Building Envelope Fenestration Maximum U-factor and SHGC Requirements
CLIMATE ZONE
5 AND MARINE 4
U-factor for Class AW windows rated in accordance with AAMA/CSA101/I.S.2/A440, vertical curtain walls and site-built fenestration productsa
FixedbU-factor
U-0.38
OperablecU-factor
U-0.40
Entrance doorsd
U-factor
U-0.60
U-factor for all other vertical fenestration
U-factor
U-0.30
SHGC for all vertical fenestration
Orientatione,f
SEW
N
PF < 0.2
0.38
0.51
0.2 ≤ PF < 0.5
0.46
0.56
PF ≥ 0.5
0.61
0.61
Skylights
U-factor
U-0.50
SHGC
0.35
 
aU-factor and SHGC shall be rated in accordance with NFRC 100.
 
b "Fixed" includes curtain wall, storefront, picture windows, and other fixed windows.
 
c "Operable" includes openable fenestration products other than "entrance doors."
 
d "Entrance door" includes glazed swinging entrance doors. Other doors which are not entrance doors, including sliding glass doors, are considered "operable."
 
e "N" indicates vertical fenestration oriented within 30 degrees of true north. "SEW" indicates orientations other than "N."
 
f Fenestration that is entirely within the conditioned space or is between conditioned and other enclosed space is exempt from solar heat gain coefficient requirements and not included in the SHGC calculation.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-402300, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402300, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402300, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40231

Section C402.4.1Maximum area.

C402.4.1 Maximum area. The total building vertical fenestration area (not including opaque doors and opaque spandrel panels) shall not exceed 30 percent of the total building gross above-grade wall area. The skylight area shall not exceed 5 percent of the total building gross roof area (skylight-to-roof ratio).
For buildings with more than one space conditioning category, compliance with the maximum allowed window-to-wall ratio and skylight-to-roof ratio shall be demonstrated separately for each space conditioning category. Interior partition ceiling, wall, fenestration and floor areas that separate space conditioning areas shall not be applied to the window-to-wall ratio and skylight-to-roof ratio calculations.
C402.4.1.1 Vertical fenestration maximum area withhigh performance alternates. For buildings that comply with Section C402.4.1.1.1 or C402.4.1.1.2, the total building vertical fenestration area is permitted to exceed 30 percent but shall not exceed 40 percent of the gross above grade wall area for the purpose of prescriptive compliance with Section C402.1.4.
When determining compliance using the component performance alternative in accordance with Section C402.1.5, the total building vertical fenestration area allowed in Equation 4-2 is 40 percent of the above grade wall area for buildings that comply with the vertical fenestration alternates described in this section.
C402.4.1.1.1 Optimized daylighting. All of the following requirements shall be met:
1. Not less than 50 percent of the total conditioned floor area in the building is within a daylight zone that includes daylight responsive controls complying with Section C405.2.4.1.
2. Visible transmittance (VT) of all vertical fenestration in the building is greater than or equal to 1.1 times the required solar heat gain coefficient (SHGC) in accordance with Section C402.4, or 0.50, whichever is greater. It shall be permitted to demonstrate compliance based on the area weighted average VT being greater than or equal to the area weighted average of the minimum VT requirements.
EXCEPTION:
Fenestration that is outside the scope of NFRC 200 is not required to comply with Item 2.
C402.4.1.1.2 High-performance fenestration. All of the following requirements shall be met:
1. All vertical fenestration in the building shall comply with the following U-factors:
a. U-factor for Class AW windows rated in accordance with AAMA/CSA101/I.S.2/A440, vertical curtain walls and site-built fenestration products (fixed) = 0.34
b. U-factor for Class AW windows rated in accordance with AAMA/CSA101/I.S.2/A440, vertical curtain walls and site-built fenestration products (operable) = 0.36
c. Entrance doors = 0.60
d. U-factor for all other vertical fenestration = 0.28
2. The SHGC of the vertical fenestration shall be less than or equal to 0.35, adjusted for projection factor in compliance with C402.4.3.
An area-weighted average shall be permitted to satisfy the U-factor requirement for each fenestration product category listed in Item 1 of this section. Individual fenestration products from different fenestration product categories shall not be combined in calculating the area-weighted average U-factor.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40231, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40231, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-40231, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40231, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40232

Section C402.4.2Minimum skylight fenestration area.

C402.4.2 Minimum skylight fenestration area. For buildings with single story enclosed spaces greater than 2,500 square feet (232 m2) in floor area that are directly under a roof and have a ceiling height greater than 15 feet (4572 mm) for no less than 75 percent of the ceiling area, these single-story spaces shall be provided with skylights and daylight responsive controls in accordance with Section C405.2.4. Space types required to comply with this provision include office, lobby, atrium, concourse, corridor, gymnasium/exercise center, convention center, automotive service, manufacturing, nonrefrigerated warehouse, retail store, distribution/sorting area, transportation, and workshop. Skylights in these spaces are required to provide a total toplit zone area not less than 50 percent of the floor area and shall provide one of the following:
1. A minimum ratio of skylight area to toplit zone area under skylights of not less than 3 percent where all skylights have a VT of at least 0.40 as determined in accordance with Section C303.1.3.
2. A minimum skylight effective aperture of at least 1 percent determined in accordance with Equation 4-5.
 
Skylight Effective Aperture
=
(0.85 x Skylight Area x Skylight VT x WF)/ Toplit zone
 
(Equation 4-5)
Where:
 
 
Skylight area
=
Total fenestration area of skylights.
Skylight VT
=
Area weighted average visible transmittance of skylights.
WF
=
Area weighted average well factor, where well factor is 0.9 if light well depth is less than 2 feet (610 mm), or 0.7 if light well depth is 2 feet (610 mm) or greater, or 1.0 for tubular daylighting devices (TDD) with VT-annual ratings measured in accordance with NFRC 203.
Light well depth
=
Measure vertically from the underside of the lowest point of the skylight glazing to the ceiling plane under the skylight.
EXCEPTIONS:
1. Skylights above daylight zones of enclosed spaces are not required in:
 
1.1. Reserved.
 
1.2. Spaces where the designed general lighting power densities are less than 0.5 W/ft2 (5.4 W/m2) and at least 10 percent lower than the lighting power allowance in Section C405.4.2.
 
1.3. Areas where it is documented that existing structures or natural objects block direct beam sunlight on at least half of the roof over the enclosed area for more than 1,500 daytime hours per year between 8 a.m. and 4 p.m.
 
1.4. Spaces where the daylight zone under rooftop monitors is greater than 50 percent of the enclosed space floor area.
 
1.5. Spaces where the total floor area minus the sidelitzone area is less than 2,500 square feet (232 m2), and where the lighting in the daylight zone is controlled in accordance with Section C405.2.3.1.
 
2. The skylight effective aperture, calculated in accordance with Equation 4-5, is permitted to be 0.66 percent in lieu of 1 percent if the VT-annual of the skylight or TDD, as measured by NFRC 203, is greater than 38 percent.
C402.4.2.1 Lighting controls in daylight zones under skylights. Daylight responsive controls complying with Section C405.2.4.1 shall be provided to control all electric lights within toplit zones.
C402.4.2.2 Haze factor. Skylights in office, storage, automotive service, manufacturing, nonrefrigerated warehouse, retail store, and distribution/sorting area spaces shall have a glazing material or diffuser with a haze factor greater than 90 percent when tested in accordance with ASTM D 1003.
EXCEPTION:
Skylights designed and installed to exclude direct sunlight entering the occupied space by the use of fixed or automated baffles, or the geometry of skylight and light well.
C402.4.2.3 Daylight zones. Daylight zones referenced in Sections C402.4.1.1 through C402.4.2.2 shall comply with Section C405.2.4.2 and C405.2.4.3, as applicable. Daylight zones shall include toplit zones and sidelit zones.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40232, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40232, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40232, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40232, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40233

Section C402.4.3Maximum U-factor and SHGC.

C402.4.3 Maximum U-factor and SHGC. The maximum U-factor and solar heat gain coefficient (SHGC) for fenestration shall be as specified in Table C402.4.
The window projection factor shall be determined in accordance with Equation 4-6.
PF = A/B
(Equation 4-6)
Where:
 
 
PF
=
Projection factor (decimal).
A
=
Distance measured horizontally from the furthest continuous extremity of any overhang, eave, or permanently attached shading device to the vertical surface of the glazing.
B
=
Distance measured vertically from the bottom of the glazing to the underside of the overhang, eave, or permanently attached shading device.
Where different windows or glass doors have different PF values, they shall each be evaluated separately.
C402.4.3.1 Reserved.
C402.4.3.2 Reserved.
C402.4.3.3 Dynamic glazing. Where dynamic glazing is intended to satisfy the SHGC and VT requirements of Table C402.4, the ratio of the higher to lower labeled SHGC shall be greater than or equal to 2.4, and the dynamic glazing shall be automatically controlled to modulate the amount of solar gain into the space in multiple steps. Dynamic glazing shall be considered separately from other fenestration, and area-weighted averaging with other fenestration that is not dynamic glazing shall not be permitted.
EXCEPTION:
Dynamic glazing is not required to comply with this section where both the lower and higher labeled SHGC already comply with the requirements of Table C402.4.
C402.4.3.4 Area-weighted U-factor. An area-weighted average shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.4. Individual fenestration products from different fenestration product categories listed in Table C402.4 shall not be combined in calculating area-weighted average U-factor.
[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40233, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40233, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40234

Section C402.4.4Doors.

C402.4.4 Doors. Opaque swinging doors shall comply with Table C402.1.4. Opaque nonswinging doors shall comply with Table C402.1.3. Opaque doors shall be considered part of the gross area of above grade walls that are part of the building thermal envelope. Other doors shall comply with the provisions of Section C402.4.3 for vertical fenestration and the entire door area, including the frame, shall be considered part of the fenestration area of the building thermal envelope.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40234, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40234, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40234, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40234, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40240

Section C402.5Air leakage-thermal envelope.

C402.5 Air leakage-thermal envelope. The thermal envelope of buildings shall comply with Sections C402.5.1 through C402.5.8.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40240, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40240, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40240, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40241

Section C402.5.1Air barriers.

C402.5.1 Air barriers. A continuous air barrier shall be provided throughout the building thermal envelope. The air barriers shall be permitted to be located on the inside or outside of the building envelope, located within the assemblies composing the envelope, or any combination thereof. The air barrier shall comply with Sections C402.5.1.1 and C402.5.1.2.
C402.5.1.1 Air barrier construction. The continuous air barrier shall be constructed to comply with the following:
1. The air barrier shall be continuous for all assemblies that are the thermal envelope of the building and across the joints and assemblies.
2. Air barrier joints and seams shall be sealed, including sealing transitions in places and changes in materials. The joints and seals shall be securely installed in or on the joint for its entire length so as not to dislodge, loosen or otherwise impair its ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation.
3. Penetrations of the air barrier shall be caulked, gasketed or otherwise sealed in a manner compatible with the construction materials and location. Sealing shall allow for expansion, contraction and mechanical vibration. Joints and seams associated with penetrations shall be sealed in the same manner or taped. Sealing materials shall be securely installed around the penetration so as not to dislodge, loosen or otherwise impair the penetrations' ability to resist positive and negative pressure from wind, stack effect, and mechanical ventilation. Sealing of concealed fire sprinklers, where required, shall be in a manner that is recommended by the manufacturer. Caulking or other adhesive sealants shall not be used to fill voids between fire sprinkler cover plates and walls or ceilings.
4. Recessed lighting fixtures shall comply with Section C402.5.8. Where similar objects are installed which penetrate the air barrier, provisions shall be made to maintain the integrity of the air barrier.
5. Construction documents shall contain a diagram showing the building's pressure boundary in plan(s) and section(s) and a calculation of the area of the pressure boundary to be considered in the test.
C402.5.1.2 Building test. The completed building shall be tested and the air leakage rate of the building envelope shall not exceed 0.25 cfm/ft2 at a pressure differential of 0.3 inches water gauge (2.0 L/s • m2 at 75 Pa) at the upper 95 percent confidence interval in accordance with ASTM E 779 or an equivalent method approved by the code official. A report that includes the tested surface area, floor area, air by volume, stories above grade, and leakage rates shall be submitted to the building owner and the Code Official. If the tested rate exceeds that defined here by up to 0.15 cfm/ft2, a visual inspection of the air barrier shall be conducted and any leaks noted shall be sealed to the extent practicable. An additional report identifying the corrective actions taken to seal air leaks shall be submitted to the building owner and the Code Official and any further requirement to meet the leakage air rate will be waived. If the tested rate exceeds 0.40 cfm/ft2, corrective actions must be made and the test completed again. A test above 0.40 cfm/ft2 will not be accepted.
1. Test shall be accomplished using either (1) both pressurization and depressurization or (2) pressurization alone, but not depressurization alone. The test results shall be plotted against the corrected P in accordance with Section 9.4 of ASTM E 779.
2. The test pressure range shall be from 25 Pa to 80 Pa per Section 8.10 of ASTM E 779, but the upper limit shall not be less than 50 Pa, and the difference between the upper and lower limit shall not be less than 25 Pa.
3. If the pressure exponent n is less than 0.45 or greater than 0.85 per Section 9.6.4 of ASTM E 779, the test shall be rerun with additional readings over a longer time interval.
C402.5.1.2.1 Building test for mixed-use buildings. Where a building is three or fewer stories above grade plane and contains both commercial and residential uses, the air barrier of the R-2 and R-3 occupancy areas of the building is permitted to be separately tested according to Section R402.4.1.2. Alternatively, it is permissible to test the air barrier of the entire building according to Section C402.5.1.2, provided that the tested air leakage rate does not exceed the rate specified in Section C402.5.1.2.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40241, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40241, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40241, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40242

Reserved.

[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40242, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40242, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40243

Section C402.5.3Rooms containing fuel-burning appliances.

C402.5.3 Rooms containing fuel-burning appliances. Where combustion air is supplied through openings in an exterior wall to a room or space containing a space conditioning fuel-burning appliance, one of the following shall apply:
1. The room or space containing the appliance shall be located outside of the building thermal envelope.
2. The room or space containing the appliance shall be enclosed and isolated from conditioned spaces inside the building thermal envelope. Such rooms shall comply with all of the following:
2.1. The walls, floor and ceiling that separate the enclosed room or space from the conditioned spaces shall be insulated to be at least equivalent to the insulation requirement of below grade walls as specified in Table C402.1.3 or C402.1.4.
2.2. The walls, floors and ceilings that separate the enclosed room or space from conditioned spaces be sealed in accordance with Section C402.5.1.1.
2.3. The doors into the enclosed room or space shall be fully gasketed.
2.4. Water lines and ducts in the enclosed room or space shall be insulated in accordance with Section C403.
2.5. Where the air duct supplying combustion air to the enclosed room or space passes through conditioned space, the duct shall be insulated to an R-value of not less than R-8.
EXCEPTION:
Fireplaces and stoves complying with Sections 901 through 905 of the International Mechanical Code, and Section 2111.13 of the International Building Code.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40243, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40243, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40243, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40244

Section C402.5.4Doors and access openings.

C402.5.4 Doors and access openings to shafts, chutes, stairways, and elevator lobbies. Doors and access openings from conditioned space to shafts, chutes, stairways and elevator lobbies shall be gasketed, weatherstripped or sealed.
EXCEPTIONS:
1. Door openings required to comply with Section 716 of the International Building Code.
 
2. Doors and door openings required to comply with UL 1784 by the International Building Code.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40244, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40244, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40244, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40245

Section C402.5.5Air intakes, exhaust openings, stairways and shafts.

C402.5.5 Air intakes, exhaust openings, stairways and shafts. Stairway enclosures, elevator shaft vents and other outdoor air intakes and exhaust openings integral to the building envelope shall be provided with dampers in accordance with Section C403.7.9.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40245, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40245, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-054, § 51-11C-40245, filed 11/25/14, effective 5/1/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40245, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40246

Section C402.5.6Loading dock weatherseals.

C402.5.6 Loading dock weatherseals. Cargo door openings and loading dock door openings shall be equipped with weatherseals that restrict infiltration and provide direct contact along the top and sides of vehicles that are parked in the doorway.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40246, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40246, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40246, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40247

Section C402.5.7Vestibules.

C402.5.7 Vestibules. All building entrances shall be protected with an enclosed vestibule, with all doors opening into and out of the vestibule equipped with self-closing devices. Vestibules shall be designed so that in passing through the vestibule it is not necessary for the interior and exterior doors to open at the same time. The installation of one or more revolving doors in the building entrance shall not eliminate the requirement that a vestibule be provided on any doors adjacent to revolving doors. For the purposes of this section, "building entrances" shall include exit-only doors in buildings where separate doors for entering and exiting are provided.
Interior and exterior doors shall have a minimum distance between them of not less than 7 feet. The exterior envelope of conditioned vestibules shall comply with the requirements for a conditioned space. Either the interior or exterior envelope of unconditioned vestibules shall comply with the requirements for a conditioned space. The building lobby is not considered a vestibule.
EXCEPTION:
Vestibules are not required for the following:
 
1. Doors not intended to be used as building entrances.
 
2. Unfinished ground-level space greater than 3,000 square feet (298 m2) if a note is included on the permit documents at each exterior entrance to the space stating "Vestibule required at time of tenant build-out if entrance serves a space greater than 3,000 square feet in area."
 
3. Doors opening directly from a sleeping unit or dwelling unit.
 
4. Doors between an enclosed space smaller than 3,000 square feet (298 m2) in area and the exterior of the building or the building entrance lobby, where those doors do not comprise one of the primary building entrance paths to the remainder of the building. The space must be enclosed and separated without transfer air paths from the primary building entrance paths. If there are doors between the space and the primary entrance path, then the doors shall be equipped with self-closing devices so the space acts as a vestibule for the primary building entrance.
 
5. Revolving doors.
 
6. Doors used primarily to facilitate vehicular movement or material handling and adjacent personnel doors.
 
7. In buildings less than 3 stories above grade or in spaces that do not directly connect with the building elevator lobby, doors that have an air curtain with a velocity of not less than 6.56 feet per second (2 m/s) at the floor that have been tested in accordance with ANSI/AMCA 220 and installed in accordance with the manufacturer's instructions. Manual or automatic controls shall be provided that will operate the air curtain with the opening and closing of the door. Air curtains and their controls shall comply with Section C408.2.3.
 
8. Building entrances in buildings that are less than four stories above grade and less than 10,000 ft2 in area.
 
9. Elevator doors in parking garages provided that the elevators have an enclosed lobby at each level of the garage.
 
10. Entrances to semi-heated spaces.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40247, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40247, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40247, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40248

Section C402.5.8Recessed lighting.

C402.5.8 Recessed lighting. Recessed luminaires installed in the building thermal envelope shall be all of the following:
1. IC rated.
2. Labeled as having an air leakage rate of not more than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential.
3. Sealed with a gasket or caulk between the housing and interior wall or ceiling covering.
[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40248, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40248, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40250

Reserved.

[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40250, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40250, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40260

Reserved.

[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40260, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40260, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40300

Section C403—Mechanical systems.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40300, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40310

Section C403.1General.

C403.1 General. Mechanical systems and equipment serving heating, cooling, ventilating, and other needs shall comply with this section.
EXCEPTIONS:
1. Energy using equipment used by a manufacturing, industrial or commercial process other than for conditioning spaces or maintaining comfort and amenities for the occupants and not otherwise regulated by Section C403.3.2, Tables C403.3.2 (1) through (12) inclusive, Sections C403.7.8, C403.9.5, C403.10.3, C403.11.2, C403.11.3, C404.2, Table C404.2, C405.8 and C410. Computer room HVAC equipment is not covered by this exception.
 
2. Data center systems are exempt from Sections C403.4 and C403.5.
C403.1.1 HVAC total system performance ratio (HVAC TSPR). For systems serving office, retail, library, and education occupancies and buildings, which are subject to the requirements of Section C403.3.5 without exceptions, the HVAC total system performance ratio (HVAC TSPR) of the proposed design HVAC system shall be more than or equal to the HVAC TSPR of the standard reference design as calculated according to Appendix D, Calculation of HVAC Total System Performance Ratio.
EXCEPTIONS:
1. Buildings with conditioned floor area less than 5,000 square feet.
 
2. HVAC systems using district heating water, chilled water or steam.
 
3. HVAC systems not included in Table D601.11.1.
 
4. HVAC systems with chilled water supplied by absorption chillers, heat recovery chillers, water to water heat pumps, air to water heat pumps, or a combination of air and water cooled chillers on the same chilled water loop.
 
5. HVAC systems served by heating water plants that include air to water or water to water heat pumps.
 
6. Underfloor air distribution HVAC systems.
 
7. Space conditioning systems that do not include mechanical cooling.
 
8. Alterations to existing buildings that do not substantially replace the entire HVAC system.
 
9. HVAC systems meeting all the requirements of the standard reference design HVAC system in Table D602.11, Standard Reference Design HVAC Systems.
C403.1.2 Calculation of heating and cooling loads. Design loads associated with heating, ventilating and air conditioning of the building shall be determined in accordance with the procedures described in ANSI/ASHRAE/ACCA Standard 183 or by an approved equivalent computational procedure, using the design parameters specified in Chapter 3. Heating and cooling loads shall be adjusted to account for load reductions that are achieved where energy recovery systems are utilized in the HVAC system in accordance with the ASHRAE HVAC Systems and Equipment Handbook by an approved equivalent computational procedure.
C403.1.3 Data centers.Data center systems shall comply with Sections 6 and 8 of ASHRAE Standard 90.4 with the following changes:
1. Replace design MLC in ASHRAE Standard 90.4 Table 6.2.1.1 "Maximum Design Mechanical Load Component (Design MLC)" with the following per the applicable climate zone:
Zone 4C Design MLC = 0.22     Zone 5B Design MLC = 0.24
2. Replace annualized MLC values of Table 6.2.1.2 "Maximum Annualized Mechanical Load Component (Annualized MLC)" in ASHRAE Standard 90.4 with the following per applicable climate zone:
Zone 4C Annual MLC = 0.18     Zone 5B Annual MLC = 0.17
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40310, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40310, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40310, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40320

Section C403.2System design.

C403.2 System design. Mechanical systems shall be designed to comply with Sections C403.2.1 and C403.2.2. Where elements of a building's mechanical systems are addressed in Sections C403.3 through C403.13, such elements shall comply with the applicable provisions of those sections.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40320, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40320, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40320, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40321

Section C403.2.1Zone isolation.

C403.2.1Zone isolation required. HVAC systems serving zones that are intended to operate or be occupied nonsimultaneously shall be divided into isolation areas. Zones may be grouped into a single isolation area provided it does not exceed 25,000 square feet (2323 m2) of conditioned floor area nor include more than one floor. Each isolation area shall be equipped with isolation devices and controls configured to automatically shut off the supply of conditioned air and outdoor air to and exhaust air from the isolation area. Each isolation area shall be controlled independently by a device meeting the requirements of Section C403.4.2.2. Central systems and plants shall be provided with controls and devices that will allow system and equipment operation for any length of time while serving only the smallest isolation area served by the system or plant.
EXCEPTIONS:
1. Exhaust air and outdoor air connections to isolation areas where the fan system to which they connect is not greater than 5,000 cfm (2360 L/s).
 
2. Exhaust airflow from a single isolation area of less than 10 percent of the design airflow of the exhaust system to which it connects.
 
3. Isolation areas intended to operate continuously or intended to be inoperative only when all other isolation areas in a zone are inoperative.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40321, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40321, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40321, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40322

Section C403.2.2Ventilation and exhaust.

C403.2.2
Ventilation and exhaust.
C403.2.2.1 Ventilation. Ventilation, either natural or mechanical, shall be provided in accordance with Chapter 4 of the International Mechanical Code. Where mechanical ventilation is provided, the system shall be configured to provide no greater than 150 percent of the minimum outdoor air required by Chapter 4 of the International Mechanical Code or other applicable code or standard, whichever is greater.
EXCEPTIONS:
1. The mechanical system may supply outdoor air at rates higher than the limit above when it is used for particulate or VOC dilution, economizer, night flushing, dehumidification, pressurization, exhaust make-up, or other process air delivery. Outdoor air shall be reduced to the minimum ventilation rates when not required for the preceding uses.
 
2. Air systems supplying Group R-1, R-2 or I-2 occupancies.
 
3. Alterations that replace less than half of the total heating and cooling capacity of the system.
 
4. Systems with energy recovery complying with the requirements of Section C403.7.6.1 that utilize sensible only active chilled beams for space cooling without any additional zonal fan power. Active chilled beams shall be permitted to utilize the increased outdoor airflow to increase space sensible capacity and to maintain space latent cooling loads without additional controls to reduce the outdoor airflow to each zone.
C403.2.2.2 Exhaust. Exhaust shall be provided in accordance with Chapters 4 and 5 of the International Mechanical Code. Where exhaust is provided, the system shall be configured to provide no greater than 150 percent of the minimum exhaust air required by Chapters 4 and 5 of the International Mechanical Code or other applicable code or standard, whichever is greater.
EXCEPTIONS:
1. The mechanical system may exhaust air at rates higher than the limit above when it is used for particulate or VOC dilution, economizer, night flushing, dehumidification, pressure equalization, relief, or other process exhaust air requirements. Outdoor air and exhaust air shall be reduced to the minimum ventilation rates when not required for the preceding uses.
 
2. Domestic range hood exhaust in Group R occupancies.
 
3. Exhaust from Group I occupancies.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40322, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40322, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40322, filed 2/1/13, effective 7/1/13.]



PDF51-11C-40323

Section C403.2.3Variable flow capacity.

C403.2.3
Variable flow capacity. For fan and pump motors 7.5 hp and greater including motors in or serving custom and packaged air handlers serving variable air volume fan systems, constant volume fans, heating and cooling hydronic pumping systems, pool and service water pumping systems, domestic water pressure-booster systems, cooling tower fan, and other pump or fan motors where variable flows are required, there shall be:
1. Variable speed drives; or
2. Other controls and devices that will result in fan and pump motor demand of no more than 30 percent of design wattage at 50 percent of design air volume for fans when static pressure set point equals 1/3 the total design static pressure, and 50 percent of design water flow for pumps, based on manufacturer's certified test data. Variable inlet vanes, throttling valves (dampers), scroll dampers or bypass circuits shall not be allowed.
EXCEPTION:
Variable speed devices are not required for motors that serve:
 
1. Fans or pumps in packaged equipment where variable speed drives are not available as a factory option from the equipment manufacturer.
 
2. Fans or pumps that are required to operate only for emergency fire-life-safety events (e.g., stairwell pressurization fans, elevator pressurization fans, fire pumps, etc.).
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40323, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40323, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40323, filed 2/1/13, effective 7/1/13.]



PDF51-11C-403231

Table C403.3.2(1)Minimum efficiency requirementsElectrically operated unitary air conditioners and condensing units.

Table C403.3.2(1)A
Minimum Efficiency RequirementsElectrically Operated Unitary Air Conditioners and Condensing Units
Equipment Type
Size Category
Heating Section Type
Subcategory or Rating Condition
Minimum Efficiency
Test ProcedureA
Air conditioners, air cooled
< 65,000 Btu/hb
All
Split System
13.0 SEER
AHRI 210/240
Single Package
14.0 SEER
Through-the-wall
(air cooled)
≤ 30,000 Btu/hb
All
Split system
12.0 SEER
Single Package
12.0 SEER
Small duct high velocity,
air cooled
< 65,000 Btu/hb
All
Split system
11.0 SEER
Air conditioners,
air cooled
≥ 65,000 Btu/h
and
< 135,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.2 EER
12.9 IEER
AHRI 210/240
All other
Split System and Single Package
11.0 EER
12.7 IEER
≥ 135,000 Btu/h
and
< 240,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.0 EER
12.4 IEER
All other
Split System and Single Package
10.8 EER
12.2 IEER
≥ 240,000 Btu/h
and
< 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
10.0 EER
11.6 IEER
All other
Split System and Single Package
9.8 EER
11.4 IEER
≥ 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
9.7 EER
11.2 IEER
All other
Split System and Single Package
9.5 EER
11.6 IEER
Air conditioners,
water cooled
< 65,000 Btu/hb
All
Split System and Single Package
12.1 EER
12.3 IEER
AHRI 210/240
≥ 65,000 Btu/h
and
< 135,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
12.1 EER
13.9 IEER
AHRI 210/240
All other
Split System and Single Package
11.9 EER
13.7 IEER
≥ 135,000 Btu/h
and
< 240,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
12.5 EER
13.9 IEER
All other
Split System and Single Package
12.3 EER
13.7 IEER
≥ 240,000 Btu/h
and
< 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
12.4 EER
13.6 IEER
All other
Split System and Single Package
12.2 EER
13.4 IEER
≥ 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
12.2 EER
13.5 IEER
All other
Split System and Single Package
12.0 EER
13.3 IEER
Air conditioners,
evaporatively cooled
< 65,000 Btu/hb
All
Split System and Single Package
12.1 EER
12.3 IEER
AHRI 210/240
≥ 65,000 Btu/h
and
< 135,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
12.1 EER
12.3 IEER
AHRI 340/360
All other
Split System and Single Package
11.9 EER
12.1 IEER
≥ 135,000 Btu/h
and
< 240,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
12.0 EER
12.2 IEER
All other
Split System and Single Package
11.8 EER
12.0 IEER
≥ 240,000 Btu/h
and
< 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.9 EER
12.1 IEER
All other
Split System and Single Package
11.7 EER
11.9 IEER
≥ 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.7 EER
11.9 EER
All other
Split System and Single Package
11.5 EER
11.7 EER
Condensing units,
air cooled
≥ 135,000 Btu/h
 
 
10.5 EER
11.8 IEER
AHRI 365
Condensing units,
water cooled
≥ 135,000 Btu/h
 
 
13.5 EER
14.0 IEER
Condensing units,
evaporatively cooled
≥ 135,000 Btu/h
 
 
13.5 EER
14.0 IEER
For SI:
1 British thermal unit per hour = 0.2931 W.
a
Chapter 12 of the referenced standard contains a complete specification of the referenced test procedure, including the reference year version of the test procedure.
b
Single-phase, air-cooled air conditioners less than 65,000 Btu/h are regulated by NAECA. SEER values are those set by NAECA.
Table C403.3.2(1)B
Minimum Efficiency RequirementsElectrically Operated Variable Refrigerant Flow Air Conditioners
Equipment Type
Size Category
Heating
Section Type
Subcategory or Rating Condition
Minimum
Efficiency
Test
Procedure
VRF Air
Conditioners,
Air Cooled
< 65,000 Btu/h
All
VRF Multi-Split System
13.0 SEER
AHRI 1230
 
≥ 65,000 Btu/h and
< 135,000 Btu/h
Electric
Resistance (or none)
VRF Multi-Split System
11.2 EER
15.5 IEER
 
 
≥ 135,000 Btu/h and
< 240,000 Btu/h
Electric
Resistance (or none)
VRF Multi-Split System
11.0 EER
14.9 IEER
 
 
≥ 240,000 Btu/h
Electric
Resistance (or none)
VRF Multi-split System
10.0 EER
13.9 IEER
 
Table C403.3.2(1)C
Minimum Efficiency RequirementsElectrically Operated Variable Refrigerant Flow Air-to-Air and Applied Heat Pumps
Equipment Type
Size Category
Heating
Section Type
Subcategory or Rating Condition
Minimum
Efficiency
Test
Procedure
VRF Air Cooled (cooling mode)
< 65,000 Btu/h
All
VRF Multi-Split System
13.0 SEER
AHRI 1230
 
≥ 65,000 Btu/h and < 135,000 Btu/h
Electric
Resistance (or none)
VRF Multi-Split System
11.0 EER
14.6 IEER
 
 
≥ 65,000 Btu/h and < 135,000 Btu/h
Electric
Resistance (or none)
VRF Multi-Split System with Heat Recovery
10.8 EER
14.4 IEER
 
 
≥ 135,000 Btu/h and < 240,000 Btu/h
Electric
Resistance (or none)
VRF Multi-Split System
10.6 EER
13.9 IEER
 
 
≥ 135,000 Btu/h and < 240,000 Btu/h
Electric
Resistance (or none)
VRF Multi-Split System with Heat Recovery
10.4 EER
13.7 IEER
 
 
≥ 240,000 Btu/h
Electric
Resistance (or none)
VRF Multi-Split System
9.5 EER
12.7 IEER
 
 
≥ 240,000 Btu/h
Electric
Resistance (or none)
VRF Multi-Split System with Heat Recovery
9.3 EER
12.5 IEER
 
VRF Water Source
(cooling mode)
< 65,000 Btu/h
All
VRF Multi-Split System
86ºF entering water
12.0 EER
16.0 IEER
AHRI 1230
 
< 65,000 Btu/h
All
VRF Multi-Split System with Heat Recovery
86ºF entering water
11.8 EER
15.8 IEER
 
 
≥ 65,000 Btu/h and < 135,000 Btu/h
All
VRF Multi-Split System
86ºF entering water
12.0 EER
16.0 IEER
 
 
≥ 65,000 Btu/h and < 135,000 Btu/h
All
VRF Multi-Split System with Heat Recovery
86ºF entering water
11.8 EER
15.8 IEER
 
 
≥ 135,000 Btu/h and < 240,000 Btu/h
All
VRF Multi-Split System
86ºF entering water
10.0 EER
14.0 IEER
 
 
≥ 135,000 Btu/h and < 240,000 Btu/h
All
VRF Multi-Split System with Heat Recovery
86ºF entering water
9.8 EER
13.8 IEER
 
 
≥ 240,000 Btu/h
All
VRF Multi-Split System
86ºF entering water
12.0 IEER
 
 
≥ 240,000 Btu/h
All
VRF Multi-Split System with Heat Recovery
86ºF entering water
11.8 IEER
 
VRF
Groundwater Source (cooling mode)
< 135,000 Btu/h
All
VRF Multi-Split System
59ºF entering water
16.2 EER
AHRI 1230
< 135,000 Btu/h
All
VRF Multi-Split System with Heat Recovery
59ºF entering water
16.0 EER
 
 
≥ 135,000 Btu/h
All
VRF Multi-Split System
59ºF entering water
13.8 EER
 
 
≥ 135,000 Btu/h
All
VRF Multi-Split System with Heat Recovery
59ºF entering water
13.6 EER
 
VRF Ground Source (cooling mode)
< 135,000 Btu/h
All
VRF Multi-Split System
77ºF entering water
13.4 EER
AHRI 1230
 
< 135,000 Btu/h
All
VRF Multi-Split System with Heat Recovery
77ºF entering water
13.2 EER
 
 
≥ 135,000 Btu/h
All
VRF Multi-Split System
77ºF entering water
11.0 EER
 
 
≥ 135,000 Btu/h
All
VRF Multi-Split System with Heat Recovery
77ºF entering water
10.8 EER
 
VRF Air Cooled (heating mode)
< 65,000 Btu/h
(cooling capacity)
VRF Multi-Split System
7.7 HSPF
AHRI 1230
 
≥ 65,000 Btu/h and < 135,000 Btu/h
(cooling capacity)
VRF Multi-Split System
47ºF db/43ºF wb outdoor air
17ºF db/15ºF wb outdoor air
3.3 COP
2.25 COP
 
 
≥ 135,000 Btu/h
(cooling capacity)
VRF Multi-Split System
47ºF db/43ºF wb outdoor air
17ºF db/15ºF wb outdoor air
3.2 COP
2.05 COP
 
VRF Water Source
(heating mode)
< 135,000 Btu/h
(cooling capacity)
VRF Multi-Split System
68ºF entering water
4.3 COP
AHRI 1230
 
≥ 135,000 Btu/h and < 240,000 Btu/h
(cooling capacity)
VRF Multi-Split System
68ºF entering water
4.0 COP
 
 
≥ 240,000 Btu/h
(cooling capacity)
VRF Multi-Split System
68ºF entering water
3.9 COP
 
VRF Groundwater Source
(heating mode)
< 135,000 Btu/h
(cooling capacity)
VRF Multi-Split System
50ºF entering water
3.6 COP
AHRI 1230
 
≥ 135,000 Btu/h
(cooling capacity)
VRF Multi-Split System
50ºF entering water
3.3 COP
 
VRF Ground Source
(heating mode)
< 135,000 Btu/h
(cooling capacity)
VRF Multi-Split System
32ºF entering water
3.1 COP
AHRI 1230
 
≥ 135,000 Btu/h
(cooling capacity)
VRF Multi-Split System
32ºF entering water
2.8 COP
 
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-403231, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-403231, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-403231, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-403231, filed 2/1/13, effective 7/1/13.]



PDF51-11C-403232

Table C403.3.2(2)Minimum efficiency requirementsElectrically operated unitary and applied heat pumps.

Table C403.3.2(2)
Minimum Efficiency RequirementsElectrically Operated Unitary and Applied Heat Pumps
Equipment Type
Size Category
Heating Section Type
Subcategory or
Rating Condition
Minimum
Efficiency
Test Procedurea
Air cooled (cooling mode)
< 65,000 Btu/hb
All
Split System
14.0 SEER
AHRI 210/240
 
 
 
Single Packaged
14.0 SEER
 
Through-the-wall, air cooled (cooling mode)
≤ 30,000 Btu/hb
All
Split System
12.0 SEER
 
 
 
 
Single Packaged
12.0 SEER
 
Small duct high velocity,
air cooled
< 65,000 Btu/hb
All
Split System
11.0 SEER
 
Air cooled (cooling mode)
≥ 65,000 Btu/h and
< 135,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.0 EER
12.2 IEER
AHRI 340/360
 
 
All Other
Split System and Single Package
10.8 EER
12.0 IEER
 
 
≥ 135,000 Btu/h and < 240,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
10.6 EER
11.6 IEER
 
 
 
All Other
Split System and Single Package
10.4 EER
11.4 IEER
 
 
≥ 240,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
9.5 EER
10.6 IEER
 
 
 
All Other
Split System and Single Package
9.3 EER
10.4 IEER
 
Water to air, water loop (cooling mode)
< 17,000 Btu/h
All
86°F entering water
12.2 EER
ISO 13256-1
 
≥ 17,000 Btu/h and
< 65,000 Btu/h
All
86°F entering water
13.0 EER
 
 
≥ 65,000 Btu/h and
< 135,000 Btu/h
All
86°F entering water
13.0 EER
 
Water to air, ground water (cooling mode)
< 135,000 Btu/h
All
59°F entering water
18.0 EER
 
Brine to air, ground loop (cooling mode)
< 135,000 Btu/h
All
77°F entering water
14.1 EER
 
Water to water, water loop (cooling mode)
< 135,000 Btu/h
All
86°F entering water
10.6 EER
ISO 13256-2
Water to water, ground water (cooling mode)
< 135,000 Btu/h
All
59°F entering water
16.3 EER
 
Brine to water, ground loop (cooling mode)
< 135,000 Btu/h
All
77°F entering fluid
12.1 EER
 
Air cooled (heating mode)
< 65,000 Btu/hb
Split System
8.2 HSPF
AHRI 210/240
 
 
Single Package
8.0 HSPF
 
Through-the-wall, (air cooled, heating mode)
≤ 30,000 Btu/hb (cooling capacity)
Split System
7.4 HSPF
 
 
 
Single Package
7.4 HSPF
 
Small-duct high velocity (air cooled, heating mode)
< 65,000 Btu/hb
Split System
6.8 HSPF
 
Air cooled
(heating mode)
≥ 65,000 Btu/h and
< 135,000 Btu/h (cooling capacity)
47°F db/43ºF wb Outdoor Air
3.3 COP
AHRI 340/360
 
 
 
17ºF db/15ºF wb Outdoor Air
2.25 COP
 
 
≥ 135,000 Btu/h (cooling capacity)
47°F db/43ºF wb Outdoor Air
3.2 COP
 
 
 
 
17ºF db/15ºF wb Outdoor Air
2.05 COP
 
Water to air, water loop (heating mode)
< 135,000 Btu/h (cooling capacity)
68°F entering water
4.3 COP
ISO 13256-1
Water to air, ground water (heating mode)
< 135,000 Btu/h (cooling capacity)
50°F entering water
3.7 COP
 
Brine to air, ground loop (heating mode)
< 135,000 Btu/h (cooling capacity)
32°F entering fluid
3.2 COP
 
Water to water, water loop (heating mode)
< 135,000 Btu/h (cooling capacity)
68°F entering water
3.7 COP
ISO 13256-2
 
 
50°F entering water
3.1 COP
 
Brine to water, ground loop (heating mode)
< 135,000 Btu/h (cooling capacity)
32°F entering fluid
2.5 COP
 
For SI:
1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8.
a
Chapter 12 of the referenced standard contains a complete specification of the referenced test procedure, including the reference year version of the test procedure.
b
Single-phase, air-cooled air conditioners less than 65,000 Btu/h are regulated by NAECA. SEER values are those set by NAECA.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-403232, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-403232, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11-403232 (codified as WAC 51-11C-403232), filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-403233

Table C403.3.2(3)Minimum efficiency requirementsElectrically operated PTAC, PTHP, SPVAC, SPVHP, room air conditioners.

Table C403.3.2(3)
Minimum Efficiency RequirementsElectrically Operated Packaged Terminal Air Conditioners, Packaged Terminal Heat Pumps, Single-Package Vertical Air Conditioners, Single-Package Vertical Heat Pumps, Room Air Conditioners and Room Air-Conditioner Heat Pumps
 
 
 
Minimum Efficiency
 
Equipment Type
Size Category (Input)
Subcategory or Rating Condition
 
 
Test Procedurea
PTAC (cooling mode) new construction
All Capacities
95°F db outdoor air
 
14.0 - (0.300 × Cap/1000) EER
AHRI 310/380
PTAC (cooling mode) replacementsb
All Capacities
95°F db outdoor air
 
10.9 - (0.213 × Cap/1000) EER
 
PTHP (cooling mode) new construction
All Capacities
95°F db outdoor air
 
14.0 - (0.300 × Cap/1000) EER
 
PTHP (cooling mode) replacementsb
All Capacities
95°F db outdoor air
 
10.8 - (0.213 × Cap/1000) EER
 
PTHP (heating mode) new construction
All Capacities
 
3.7 - (0.052 × Cap/1000) COP
 
PTHP (heating mode) replacementsb
All Capacities
 
2.9 - (0.026 × Cap/1000) COP
 
SPVAC (cooling mode)
< 65,000 Btu/h
95°F db/75°F wb outdoor air
 
11.0 EER
AHRI 390
 
≥ 65,000 Btu/h and
< 135,000 Btu/h
95°F db/75°F wb outdoor air
 
11.0 EER
 
 
≥ 135,000 Btu/h and
< 240,000 Btu/h
95°F db/75°F wb outdoor air
 
11.0 EER
 
SPVHP (cooling mode)
< 65,000 Btu/h
95°F db/75°F wb outdoor air
 
11.0 EER
 
 
≥ 65,000 Btu/h and
< 135,000 Btu/h
95°F db/75°F wb outdoor air
 
11.0 EER
 
 
≥ 135,000 Btu/h and
< 240,000 Btu/h
95°F db/75°F wb outdoor air
 
11.0 EER
 
SPVHP (heating mode)
<65,000 Btu/h
47°F db/43°F wb outdoor air
 
3.3 COP
AHRI 390
 
≥ 65,000 Btu/h and
< 135,000 Btu/h
47°F db/43°F wb outdoor air
 
3.3 COP
 
 
≥ 135,000 Btu/h and
< 240,000 Btu/h
47°F db/43°F wb outdoor air
 
3.3 COP
 
Room air conditioners, with louvered sides
< 6,000 Btu/h
 
11.0 CEER
ANSI/AHA-MRAC-1
 
≥ 6,000 Btu/h and
< 8,000 Btu/h
 
11.0 CEER
 
 
≥ 8,000 Btu/h and
< 14,000 Btu/h
 
10.9 CEER
 
 
≥ 14,000 Btu/h and
< 20,000 Btu/h
 
10.7 CEER
 
 
≥ 20,000 Btu/h and
< 25,000 Btu/h
 
9.4 CEER
 
 
≥ 25,000 Btu/h
 
9.0 CEER
 
Room air conditioners, without louvered sides
< 6,000 Btu/h
 
10.0 CEER
 
 
≥ 6,000 Btu/h and
< 8,000 Btu/h
 
10.0 CEER
 
 
≥ 8,000 Btu/h and
< 11,000 Btu/h
 
9.6 CEER
 
 
≥ 11,000 Btu/h and
<  14,000 Btu/h
 
9.5 CEER
 
 
≥ 14,000 Btu/h and < 20,000 Btu/h
 
9.3 CEER
 
 
≥ 20,000 Btu/h
 
9.4 CEER
 
Room air-conditioner heat pumps with louvered sides
< 20,000 Btu/h
 
9.8 CEER
 
 
≥ 20,000 Btu/h
 
9.3 CEER
 
Room air-conditioner heat pumps without louvered sides
< 14,000 Btu/h
 
9.3 CEER
 
 
≥ 14,000 Btu/h
 
8.7 CEER
 
Room air conditioner casement only
All capacities
 
9.5 CEER
 
Room air conditioner casement-slider
All capacities
 
10.4 CEER
 
For SI:
1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8.
 
"Cap" = The rated cooling capacity of the product in Btu/h. If the unit's capacity is less than 7000 Btu/h, use 7000 Btu/h in the calculation. If the unit's capacity is greater than 15,000 Btu/h, use 15,000 Btu/h in the calculations.
a
Chapter 12 of the referenced standard contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.
b
Replacement unit shall be factory labeled as follows: "manufactured for nonstandard size applications only; not to be installed in new standard projects" or "manufactured for replacement applications only: not to be installed in new construction projects." Replacement efficiencies apply only to units with existing sleeves less than 16 inches (406 mm) in height and less than 42 inches (1067 mm) in width.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-403233, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-403233, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-403233, filed 2/1/13, effective 7/1/13.]
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.



PDF51-11C-403234

Table C403.3.2(4)—Minimum efficiency requirements—Warm air furnaces and unit heaters.

Table 403.3.2(4)
Warm Air Furnaces and Combination Warm Air Furnaces/Air-Conditioning Units, Warm Air Duct Furnaces and Unit Heaters, Minimum Efficiency Requirements
Equipment Type
Size Category (Input)
Subcategory or Rating Condition
Minimum Efficiencyd, e
Test Procedurea
Warm air furnaces, gas fired
< 225,000 Btu/h
80% AFUE or 80% Etc
DOE 10 C.F.R. Part 430 or ANSI Z21.47
 
≥ 225,000 Btu/h
Maximum capacityc
80% Etf
ANSI Z21.47
Warm air furnaces, oil fired
< 225,000 Btu/h
83% AFUE or 80% Etc
DOE 10 C.F.R. Part 430 or UL 727
 
≥ 225,000 Btu/h
Maximum capacityb
81% Etg
UL 727
Warm air duct furnaces, gas fired
All capacities
Maximum capacityb
80% Ec
ANSI Z83.8
Warm air unit heaters, gas fired
All capacities
Maximum capacityb
80% Ec
ANSI Z83.8
Warm air unit heaters, oil fired
All capacities
Maximum capacityb
80% Ec
UL 731
For SI:
1 British thermal unit per hour = 0.2931 W.
a
Chapter 12 of the referenced standard contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.
b
Minimum and maximum ratings as provided for and allowed by the unit's controls.
c
Combination units not covered by the National Appliance Energy Conservation Act of 1987 (NAECA) (3-phase power or cooling capacity greater than or equal to 65,000 Btu/h [19 kW]) shall comply with either rating.
 
dEt
=
Thermal efficiency. See test procedure for detailed discussion.
 
eEc
=
Combustion efficiency (100% less flue losses). See test procedure for detailed discussion.
 
fEc
=
Combustion efficiency. Units must also include an IID, have jackets not exceeding 0.75 percent of the input rating, and have either power venting or a flue damper. A vent damper is an acceptable alternative to a flue damper for those furnaces where combustion air is drawn from the conditioned space.
 
gEt
=
Thermal efficiency. Units must also include an IID, have jacket losses not exceeding 0.75 percent of the input rating, and have either power venting or a flue damper. A vent damper is an acceptable alternative to a flue damper for those furnaces where combustion air is drawn from the conditioned space.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-403234, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-403234, filed 2/1/13, effective 7/1/13.]
Reviser's note: The