Energy · IECC 2021 §R402.2.1
Ceiling Insulation Compression Allowance R-38 Over R-49
Eave section showing where R-38 over the whole ceiling may stand in for a required R-49 (or R-49 for R-60) when full-height insulation covers the top plate, with the ceiling R-values by zone.. Referenced to IECC 2021 §R402.2.1.
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