this post was submitted on 27 Dec 2024
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Best way to insulate attic with full plywood flooring? (lemmy.sdf.org)
submitted 1 week ago by [email protected] to c/[email protected]
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My house entire attic has plywood flooring over the joists/insulation.

It is nailed in and a pain in the ass to remove.

What is the best way to add additional insulation to the attic? I worry the plywood/insulation underneath has a bad r value.

Do I need to take up all the plywood and re insulate the batts? Should I just loose fill on top of the plywood?

Ideally I want to air seal it to but taking the plywood up will be a nightmare.

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[–] [email protected] 0 points 1 week ago

Spray foam the underside of your roof deck (sorry, it's no cheap) unless you're going to pull the plywood. Be aware that if you live in a really hot climate the spray foam will shorten the life of your shingles unless you have something other than asphalt shingle roofing.