The Seattle Energy Code (SMC 22.901) adopts amended IECC commercial provisions requiring high-solar-reflectance roofing on most low-slope new construction and reroofs. Permits require compliance documentation through SDCI.
Seattle's Energy Code, codified at SMC 22.901 and updated on the IECC three-year cycle, requires low-slope roofs on new commercial buildings and major reroofs to meet a minimum three-year aged solar reflectance index (SRI) of 64 or use a high-reflectance membrane with SRI 78 initial. Residential pitched roofs are not affected unless air-conditioned. Exceptions apply for ballasted, vegetated, or photovoltaic-covered roof areas. The 2021 amendments tightened envelope and roof requirements as part of climate action. SDCI reviews compliance through ComCheck or prescriptive paths during permit review. Reroofs over 50% of roof area trigger compliance.
Permit denial or stop-work order if roofing fails Energy Code review. Civil penalties under SMC 22.901 up to $500 per day; rework required to obtain final inspection.
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