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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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[–] InEnduringGrowStrong 2 points 1 week ago

Depends if you wanna use it for storage or something.
If not, just use urethane to seal and top with loose fill.

If you wanna keep the surface provided by the plywood and specifically insulate underneath the plywood then it's a bit more work, though there are companies that insulate by drilling holes and adding expansion foam. I've mostly seen them do exterior walls, but I imagine the same concept can be done on the attic. If DIY, consider the risk of blowout if the foam expands too much.

If you end up removing the plywood... cut it up there with a circular saw set to a shallow depth as to not cut the joists.
Smaller pieces are easier to pry off, as well as easier to get out of the attic.
It's on the expensive side, but a battery circular saw is just fabulous.

If adding loose fill, use baffles so the soffit can still breathe.