What R Value Should Attic Insulation Be - Web depending on where you live and the part of your home you’re insulating (walls, crawlspace, attic, etc.), you’ll need a. Web r value = 6 inches / 0.24 btu/ (hr ft^2 °f) = 25.
Web depending on where you live and the part of your home you’re insulating (walls, crawlspace, attic, etc.), you’ll need a. Web r value = 6 inches / 0.24 btu/ (hr ft^2 °f) = 25.