R-Value is a measure of insulation’s ability to resist heat passing through it.

The higher the R-Value the better the thermal performance of the insulation.  R-Value is a number given “per inch of thickness”.  For example, an insulation type with an R-Value of 5 means “5 per inch of thickness”.  Therefore, a 1” thick layer would have an R-Value of 5; a 2” thick layer an RValue of 10 and so on.  Thickness matters!

US Department of Energy R-Value recommendations by climate zone. 

DOE R-Value recommendations by climate zone map

Insulation Recommendations for New Wood-Framed Houses

Table of R-Value recommendations for wood frame construction

Insulation Recommendations for Existing Wood-Framed Houses

Table of R-Value recommendations for existing wood frame construction

Menu