Recommended Home Insulation R–Values

Insulation levels are specified by R-Value. R-Value is a measure of insulation’s ability to resist heat traveling through it. The higher the R-Value the better the thermal performance of the insulation.

What Is Insulation R-Value Homeowner's Insulation Resource

If R-38 is our code, why do I recommend R-49 for attic insulation? - Bird Family Insulation

Know Your R-Value The House Designers

Envelope PA Energy Code

How Much Insulation Does Your Home Need?

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What R-Value Do I Need?

New Attic Insulation Information - Aladdin Insulation & Home Improvements