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PDFWAC 51-11R-40211

Table R402.1.1Insulation and fenestration requirements by component.

TABLE R402.1.1
INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa
Climate Zone
Fenestration
U-Factorb
Skylightb
U-Factor
Glazed
Fenestration SHGCb, e
Ceiling
R-Valuek
Wood Frame Wallg, m, n
R-Value
Mass Wall
R-Valuei
Floor
R-Value
Below-
Gradec, m Wall R-Value
Slabd
R-Value & Depth
5 and Marine 4
0.30
0.50
NR
49
21 int
21/ 21
30
10/15/
21int+TB
10, 2 ft
For SI:
1 foot = 304.8 mm, ci = continuous insulation, int = intermediate framing.
 
aR-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less than the label or design thickness of the insulation, the compressed R-value of the insulation from Appendix Table A101.4 shall not be less than the R-value specified in the table.
 
b The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration.
 
c "10/15/21+TB" means R-10 continuous insulation on the exterior of the wall, or R-15 on the continuous insulation on the interior of the wall, or R-21 cavity insulation plus a thermal break between the slab and the basement wall at the interior of the basement wall. "10/15/21+TB" shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the wall. "TB" means thermal break between floor slab and basement wall.
 
d R-10 continuous insulation is required under heated slab on grade floors. See R402.2.9.1.
 
e There are no SHGC requirements in the Marine Zone.
 
f Reserved.
 
g Reserved.
 
h Reserved.
 
i The second R-value applies when more than half the insulation is on the interior of the mass wall.
 
j Reserved.
 
k For single rafter- or joist-vaulted ceilings, the insulation may be reduced to R-38.
 
l Reserved.
 
m Int. (intermediate framing) denotes standard framing 16 inches on center with headers insulated with a minimum of R-10 insulation.
 
n Log and solid timber walls with a minimum average thickness of 3.5 inches are exempt from this insulation requirement.
[Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-063, § 51-11R-40211, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40211, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-121, § 51-11R-40211, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40211, filed 2/1/13, effective 7/1/13.]
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