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PDFWAC 51-11C-402300

Table C402.4Building envelope requirementsFenestration.

Table C402.4
Building Envelope Fenestration Maximum U-factor and SHGC Requirements
CLIMATE ZONE
5 AND MARINE 4
 
Vertical Fenestration
U-factor
 
 
Nonmetal framing (all)a
0.30
 
Metal framing (fixed)b
0.38
 
Metal framing (operable)c
0.40
 
Metal framing (entrance doors)d
0.60
 
SHGC
 
 
Orientation
SEW
N
PF < 0.2
0.40
0.53
0.2 < PF < 0.5
0.48
0.58
PF ˃ 0.5
0.64
0.64
Skylights
U-factor
0.50
 
SHGC
0.35
 
NR =
No requirement.
 
a "Nonmetal framing" includes framing materials other than metal, with or without metal reinforcing or cladding.
 
b "Metal framing" includes metal framing, with or without thermal break. "Fixed" includes curtain wall, storefront, picture windows, and other fixed windows.
 
c "Metal framing" includes metal framing, with or without thermal break. "Operable" includes openable fenestration products other than "entrance doors."
 
d "Metal framing" includes metal framing, with or without thermal break. "Entrance door" includes glazed swinging entrance doors. Other doors which are not entrance doors, including sliding glass doors, are considered "operable."
[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.]
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