The recommended level for most attics is to insulate to R-38 (or about 12 -15 inches, depending on the insulation type). In Northern climates, as much as R-49 is recommended. R-Value is a measure of the insulation’s ability to resist heat flow.
The higher the R-Value, the better the thermal performance. Visit
ENERGY STAR Home Sealing for more information, including recommendations for
how much insulation you should have.
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