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WACs > Title 51 > Chapter 51-11R > Section 51-11R-30311











51-11R-30310    

51-11R-30312







Agency filings affecting this section







WAC 51-11R-30311









Table R303.1.3(1)—Default glazed fenestration U-factor.









TABLE R303.1.3(1) DEFAULT GLAZED FENESTRATION 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 a) and b) above.

[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.]