The 2018 Washington State Energy Code, which is actually a combination of the 2018 International Energy Conservation Code (IECC) and the 2015 Washington State Energy Code (WSEC), has now been divided into commercial and residential provisions – both are available to download below:
Based on the 2018 IECC, “Residential” includes one- and two-family dwellings, townhouses and group R-2 and R-3 buildings three stories or less. “Commercial” includes all buildings not covered under “residential.”
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