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51-11R-40213  <<  51-11R-40215 >>   51-11R-40220

(Effective until March 15, 2024)

### Target/Proposed UA equations.

EQUATION 1 - GROUP R OCCUPANCY
TARGET UA
 UAT = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS
 Where: UAT = The target combined thermal transmittance of the gross exterior wall, floor and roof/ceiling area. UW = The thermal transmittance value of the opaque above grade wall found in Table R402.1.3. AW = Opaque above grade wall area. UBGW = The thermal transmittance value of the below grade opaque wall found in Table R402.1.3. ABGW = Opaque below grade wall area. UVG = The thermal transmittance value of the fenestration found in Table R402.1.3. AVG = (a) The proposed glazing area; where proposed fenestration glazing area is less than 15 percent of the conditioned floor area, minus AOG. (b) 15 percent of the conditioned floor area; where the proposed fenestration glazing area is 15 percent or more of the conditioned floor area, minus AOG. UOG = The thermal transmittance value of the skylight glazing found in Table R402.1.3. AOG = Skylight glazing area (if the proposed AOG exceeds 15 percent, the target AOG shall be 15 percent of the total floor area of the conditioned space). UF = The thermal transmittance value of the floor found in Table R402.1.3. AF = Floor area over unconditioned space. URC = The thermal transmittance value of the ceiling found in Table R402.1.3. ARC = Roof/ceiling area. UD = The thermal transmittance value of the fenestration found in Table R402.1.3. AD = Opaque door area. FS = Concrete slab on grade component F-factor found in Table R402.1.3. PS = Lineal ft. of concrete slab on grade perimeter. FBGS = Concrete below grade slab component F-factor found in Table R402.1.3. PBGS = Lineal ft. of concrete below grade slab perimeter.
EQUATION 2 - GROUP R OCCUPANCY
PROPOSED UA
 UA = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS
 Where: UA = The combined thermal transmittance of the gross exterior wall, floor and roof/ceiling assembly area. UW = The thermal transmittance of the opaque above grade wall area. AW = Opaque above grade wall area. UBGW = The thermal transmittance value of the below grade opaque wall. ABGW = Opaque below grade wall area. UVG = The thermal transmittance value of the fenestration glazing. AVG = Fenestration glazing area, including windows in exterior doors. UOG = The thermal transmittance value of the skylight glazing. AOG = Skylight glazing area. UF = The thermal transmittance of the floor. AF = Floor area over unconditioned space. URC = The thermal transmittance of the ceiling. ARC = Ceiling area. UD = The thermal transmittance value of the opaque door area. AD = Opaque door area. FS = Concrete slab on grade component F-factor. PS = Lineal ft. of concrete slab on grade perimeter. FBGS = Concrete below grade slab component F-factor. PBGS = Lineal ft. of concrete below grade slab perimeter.
 NOTE: Where more than one type of wall, window, roof/ceiling, door and skylight is used, the U and A terms for those items shall be expanded into subelements as: UW1AW1 + UW2AW2 + UW3AW3 + ...etc.
 NOTE: Below grade walls: The wall is assumed to extend from the slab upward to the top of the mud sill for the distance specified in Table A104.1, with 6 inches of concrete wall extending above grade. This will be calculated separately from above grade walls using the wall height that best describes the system.
[Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40215, filed 12/9/19, effective 7/1/20.]
(Effective March 15, 2024)

### Target/Proposed UA equations.

EQUATION 1 - GROUP R OCCUPANCY
TARGET UA
 UAT = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS
 Where: UAT = The target combined thermal transmittance of the gross exterior wall, floor and roof/ceiling area. UW = The thermal transmittance value of the opaque above grade wall found in Table R402.1.2. AW = Opaque above grade wall area. UBGW = The thermal transmittance value of the below grade opaque wall found in Table R402.1.2. ABGW = Opaque below grade wall area. UVG = The thermal transmittance value of the fenestration found in Table R402.1.2. AVG = (a) The proposed glazing area; where proposed fenestration glazing area is less than 15 percent of the conditioned floor area, minus AOG. (b) 15 percent of the conditioned floor area; where the proposed fenestration glazing area is 15 percent or more of the conditioned floor area, minus AOG. UOG = The thermal transmittance value of the skylight glazing found in Table R402.1.2. AOG = Skylight glazing area (if the proposed AOG exceeds 15 percent, the target AOG shall be 15 percent of the total floor area of the conditioned space). UF = The thermal transmittance value of the floor found in Table R402.1.2. AF = Floor area over unconditioned space. URC = The thermal transmittance value of the ceiling found in Table R402.1.2. ARC = Roof/ceiling area. UD = The thermal transmittance value of the fenestration found in Table R402.1.2. AD = Opaque door area. FS = Concrete slab on grade component F-factor found in Table R402.1.2. PS = Lineal ft. of concrete slab on grade perimeter. FBGS = Concrete below grade slab component F-factor found in Table R402.1.2. PBGS = Lineal ft. of concrete below grade slab perimeter.
EQUATION 2 - GROUP R OCCUPANCY
PROPOSED UA
 UA = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS
 Where: UA = The combined thermal transmittance of the gross exterior wall, floor and roof/ceiling assembly area. UW = The thermal transmittance of the opaque above grade wall area. AW = Opaque above grade wall area. UBGW = The thermal transmittance value of the below grade opaque wall. ABGW = Opaque below grade wall area. UVG = The thermal transmittance value of the fenestration glazing. AVG = Fenestration glazing area, including windows in exterior doors. UOG = The thermal transmittance value of the skylight glazing. AOG = Skylight glazing area. UF = The thermal transmittance of the floor. AF = Floor area over unconditioned space. URC = The thermal transmittance of the ceiling. ARC = Ceiling area. UD = The thermal transmittance value of the opaque door area. AD = Opaque door area. FS = Concrete slab on grade component F-factor. PS = Lineal ft. of concrete slab on grade perimeter. FBGS = Concrete below grade slab component F-factor. PBGS = Lineal ft. of concrete below grade slab perimeter.
 NOTE: Where more than one type of wall, window, roof/ceiling, door and skylight is used, the U and A terms for those items shall be expanded into subelements as: UW1AW1 + UW2AW2 + UW3AW3 + ...etc.
 NOTE: Below grade walls: The wall is assumed to extend from the slab upward to the top of the mud sill for the distance specified in Table A104.1, with 6 inches of concrete wall extending above grade. This will be calculated separately from above grade walls using the wall height that best describes the system.
[Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40215, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40215, filed 12/9/19, effective 7/1/20.]
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