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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You could stuff the loft space with insulation. But lifts are often used for storage, and there are benefits to allowing air to move in the roof structure; if there is any kind of leak in your roofing materials having sure free moving allowsthe roof structure to dry.
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