Attic
Blown-In Insulation Calculator: Bags and Depth From the Bag Chart
Bags and depth for blown-in attic insulation come from the chart on the bag, and both must be met. At R-49 over…
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AtticHow Much Insulation Do I Need? R-Value by Climate Zone
ENERGY STAR's table for existing homes says R30 in zone 1, R49 in zones 2 and 3 and R60 in zones 4…