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Area to Insulate
sq ft
Insulation Type
Fiberglass Batts
Blown-In Cellulose
Spray Foam (closed cell)
Rigid Foam Board
Target R-Value
R-13 (walls)
R-19 (floors)
R-30 (attic)
R-38 (attic, cold climate)
R-49 (attic, very cold)
Results
Thickness Required
9.4"
For R-30 with batts
Batts Needed
25 rolls
~40 sq ft per roll
Estimated Cost
$650
Materials only
R-Value per Inch
3.2
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