2012 IECC for Commercial Buildings (Tennessee)

Last updated: 21 February 2019
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

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End uses covered
  • Building end-uses
  • Building systems
  • Lighting
  • Building envelope