If home insulation is so great (and no argument that it is), why is my attic 90% air above about a foot of insulation? Why isn’t the insulation 2 or 3 or even 8 feet deep? It works to keep heat out just as much as it keeps heat in, right?
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Insulation is installed according to a minimum depth that depends on your location. For instance I am in zone 2 and requires 8 inches of R-30 insulation. I installed 12 inches because I had extra. You can add any extra you want.
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