Ashrae Envelope Requirements: 4C
ASHRAE 90.1-2022 building envelope thermal requirements by climate zone and assembly type — maximum U-values, minimum R-values, maximum SHGC for non-residential construction
| climate zone | assembly type | max U value (Btu/h/ft2/F) | notes |
|---|---|---|---|
| 4C | mass_wall | 0.104 | R-7.6ci |
| 4C | metal_frame_wall | 0.064 | Zone 4C: Seattle WA; marine |
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