PDFWAC 51-11R-30311
Table R303.1.3(1)—Default glazed fenestration U-factor.
TABLE R303.1.3(1)
DEFAULT GLAZED WINDOW, GLASS DOOR AND SKYLIGHT U-FACTOR
FRAME TYPE | SINGLE PANE | DOUBLE PANE | |
Metal | 1.20 | 0.80 | SKYLIGHT |
Metal with Thermal Breaka | 1.10 | 0.65 | See Table R303.1.3(4) |
Nonmetal or Metal Clad | 0.95 | 0.55 | |
Glazed Block | 0.60 | ||
a | Metal Thermal Break = A metal thermal break framed window shall incorporate the following minimum design characteristics: |
1) The thermal conductivity of the thermal break material shall be not more than 3.6 Btu-in/h/ft2/°F; | |
2) The thermal break material must produce a gap in the frame material of not less than 0.210 inches; and | |
3) All metal framing members of the products exposed to interior and exterior air shall incorporate a thermal break meeting the criteria in 1) and 2) above. |
[Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-30311, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-30311, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30311, filed 2/1/13, effective 7/1/13.]