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Insulation Fundamentals: R-Value

Insulation is measured in R-value, the capacity of an insulating material to resist heat flow. The higher the R-value, the greater the insulating power.
When you’re purchasing insulation, buy or specify R-value, not inches, as R-values of materials vary.
 
Achieve a higher total R-value by "combining" two different R-values. For example, R-38 added to an R-11 results in R-49.
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