Recommended Home Insulation R–Values

Insulation levels are specified by R-Value. R-Value is a measure of insulation’s ability to resist heat traveling through it. The higher the R-Value the better the thermal performance of the insulation.

Insulation Department of Energy

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If R-38 is our code, why do I recommend R-49 for attic insulation? - Bird Family Insulation

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Insulation Levels for Cold, Hot and Moderate Climates

2021 What is R-value? Insulation R-value Explained - Foilboard

Insulation R-values and cavity depths

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