Insulation R Value Chart
Insulation R Value Chart. The higher the R-Value the better the thermal performance of the insulation. R-Value is a measure of insulation's ability to resist heat traveling through it.
Below is BPI's rating for insulation if the manufacturer's R-value rating is not available. R-Value is a measure of insulation's ability to resist heat traveling through it. Closed-cell spray foam has a far better R-value per inch than other, less effective insulations like cellulose, fiberglass, or even open-cell foam.
Another thing that can lower the R-Value of fiberglass, as well as cellulose is if either of the materials gets wet.
Simply put, It's the ability to resist heat flow — insulation's thermal resistance.
The chart below displays the compressed R-value of standard batt products installed across several nominal framing cavity depths. It is intended as a simple, non-technical rating which consumers can understand. The higher the R-value, the better.
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Douglas Crumb
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