International Energy Conservation Code (IECC)

Energy Efficiency

The IECC prescribes insulated sidings as a building material that can be used as a form of continuous insulation outside of the building framing to provide the required total wall R-Value.

Insulated vinyl sidings can be used to meet the R-Value/U-factor requirements of the IECC. The tested R-Value for insulated siding is required by the code N1101.10.1 (R303.1.1) to be labeled on the package of the insulated cladding.

IRC N1102.1.3 (R402.1.3) of the IECC allows the R-Value of insulated siding to be used as part of the prescriptive R-Value computation approach and may be used to satisfy the R-Value insulation requirements of IRC N1102.1.3 (R402.1.3) through the requirements of either Table R402.1.2 or R402.1.3.