Three Reasons to Remove Attic Floor Insulation in a Sealed Attic

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I get asked a lot of questions about spray foam. Do I need an ignition barrier? Should I use open-cell or closed-cell spray foam? Will open-cell spray foam really rot my roof?

But the question I get more than any other on this topic is about whether or not the insulation on the attic floor should be removed when insulating the roof deck in an existing home. As you can tell from the title of this article, my answer is to remove it. Here are my three reasons, in increasing order of importance.

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[source: http://www.greenbuildingadvisor.com/articles/dept/building-science/three-reasons-remove-attic-floor-insulation-sealed-attic]