Wash. Admin. Code § 51-11C-402300
Table C402.4
Building Envelope Fenestration Maximum U-factor and SHGC Requirements
CLIMATE ZONE | 5 AND MARINE 4 | |
U-factor for Class AW windows rated in accordance with AAMA/CSA101/I.S.2/A440, vertical curtain walls and site-built fenestration productsa | ||
FixedbU-factor | U-0.34 | |
OperablecU-factor | U-0.36 | |
Entrance doorsd | ||
U-factor | U-0.60 | |
U-factor for all other vertical fenestration | ||
Fixed U-factor | U-0.26 | |
Operable or mulled windows with fixed and operable sections U-factor | U-0.28 | |
SHGC for all vertical fenestrationf | ||
Fixed | Operable | |
PF [LESS THAN] 0.2 | 0.38 | 0.33 |
0.2 [LESS THAN EQUAL TO] PF [LESS THAN] 0.5 | 0.46 | 0.40 |
PF [GREATER THAN EQUAL TO] 0.5 | 0.61 | 0.53 |
Skylights | ||
U-factor | U-0.50 | |
SHGC | 0.35 | |
aU-factor and SHGC shall be rated in accordance with NFRC 100.
b "Fixed" includes curtain wall, storefront, picture windows, and other fixed windows.
c "Operable" includes openable fenestration products other than "entrance doors."
d "Entrance door" includes glazed swinging entrance doors. Other doors which are not entrance doors, including sliding glass doors, are considered "operable."
e Reserved.
f Fenestration that is entirely within the conditioned space or is between conditioned and other enclosed space is exempt from solar heat gain coefficient requirements and not included in the SHGC calculation.
Wash. Admin. Code § 51-11C-402300
Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. 13-04-056, § 51-11C-402300, filed 2/1/13, effective 7/1/13.