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Recommended Home Insulation R–Values - ENERGY STAR
All About Insulation R-Values - The Home Depot
Insulation R-Value Chart: R-Values Per Inch (For 51 Materials)
What R-value Do I Need? - Johns Manville
How Much Attic Insulation Do I Need? - Insulation Institute
Insulation Thickness R-Value Chart & An Explanation of R-Value
Insulation Buying Guide - Lowe's
Insulation - Department of Energy
Types of Insulation - Department of Energy