Construction
Attic Insulation Calculator
Square footage and target R-value give bags of fiberglass or cellulose blown-in insulation.
Bags needed
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- Depth (inches)
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- Coverage / bag
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- Approx cost
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FAQ
Why R-49? +
DOE recommends R-49 to R-60 for attics in cold climates and R-30 to R-49 in warm climates.
Cellulose vs fiberglass? +
Cellulose has slightly higher R per inch and better air sealing, but absorbs moisture. Fiberglass is lighter and cheaper.