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Recommended insulation levels for retrofitting existing wood-framed buildings



Adding Insulation to an Attic      Floor
Uninsulated AtticExisting 3–4 Inches of Insulation
1 R30 to R49 R25 to R30 R13
2 R30 to R60 R25 to R38 R13 to R19
3 R30 to R60 R25 to R38 R19 to R25
4 R38 to R60 R38 R25 to R30
5 to 8 R49 to R60 R38 to R49 R25 to R30


Appalachian Insulation Supply Tools for Homeowners and Contractors

Use these links to access JM’s free online calculators and Estimators for Square footage, R-Value by Zip code, etc..

Square Footage Calculator

R-value Estimator by Zip Code

Home Energy Calculator

Below is a list of Industry Resources for answers on energy related topics.