2012 IECC (Idaho)
Commercial: 2012 IECC without amendments
Residential: 2012 IECC with amendments, bringing the effective results back to the levels contained in the 2009 codes.
Amendments include:
Fenestration: Climate Zones marine 4, 5, and 6 - U-factor amended from 0.32 to 0.35
Skylights: Climate Zones marine 4, 5, and 6 - U-factor amended from 0.55 to 0.60
Ceiling: Climate Zones marine 4 and 5 – R-value amended from R49 to R38 and U-factors from 0.026 to 0.030
Wood framed Wall: Climate Zone 6 – R-value amended from 20+5 or 13+10 to 20 or 13+5 and U-factors from 0.48 to 0.57
Mass Wall: Climate Zone 6 –R-value amended for cavity insulation from R20 to R19
Basement wall: Climate Zone Marine 4 and 5 – R-values amended from 15/19 to 10/13 and U-factors from 0.050 to 0.059
Crawlspace: Climate Zones Marine 4, 5, and 6 – R-values amended from 15/19 to 10/13 and U-factors from 0.055 to 0.065
Steel framed walls changes in equivalent R-values
Air infiltration: Air tightness requirement changes from 3 ACH to 7 ACH and includes the option for a visual inspection in place of testing
Log construction – separate minimum R-values for building envelope assemblies
Compliance option added “REScheck” using 2012 IECC code option (no amendments)
Lighting: Amended 75% to 50% high efficacy
2015 IECC for commercial buildings became effective Jan. 1, 2018.
Residential: 2012 IECC with amendments, bringing the effective results back to the levels contained in the 2009 codes.
Amendments include:
Fenestration: Climate Zones marine 4, 5, and 6 - U-factor amended from 0.32 to 0.35
Skylights: Climate Zones marine 4, 5, and 6 - U-factor amended from 0.55 to 0.60
Ceiling: Climate Zones marine 4 and 5 – R-value amended from R49 to R38 and U-factors from 0.026 to 0.030
Wood framed Wall: Climate Zone 6 – R-value amended from 20+5 or 13+10 to 20 or 13+5 and U-factors from 0.48 to 0.57
Mass Wall: Climate Zone 6 –R-value amended for cavity insulation from R20 to R19
Basement wall: Climate Zone Marine 4 and 5 – R-values amended from 15/19 to 10/13 and U-factors from 0.050 to 0.059
Crawlspace: Climate Zones Marine 4, 5, and 6 – R-values amended from 15/19 to 10/13 and U-factors from 0.055 to 0.065
Steel framed walls changes in equivalent R-values
Air infiltration: Air tightness requirement changes from 3 ACH to 7 ACH and includes the option for a visual inspection in place of testing
Log construction – separate minimum R-values for building envelope assemblies
Compliance option added “REScheck” using 2012 IECC code option (no amendments)
Lighting: Amended 75% to 50% high efficacy
2015 IECC for commercial buildings became effective Jan. 1, 2018.
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