I own a 1940s home with a basement. The walls in some areas of the basement were bowing, which is common here in western Pennsylvania (zone 5) due to wet soil and collapse of the terra cota exterior footer drainpipe. Sooo we all get interior french drains...
I want to furnish the basement again by framing, hanging drywall and placing an engineered wood floor.
I now have an interior french drain with only a few inches of concrete over the drain trough. The drain was installed 2.5 years ago and there has never been water in the sump. There is a plastic vapor barrier nailed against the wall with plastic washers. The sump sits 5inches from the foundation wall, so I don't have a tremendous amount of space for insulation and a gap...
How should I insulate the basement? I see options as open cell spray foam on the vapor barrier, XPS against the vapor barrier or fiberglass bats in the walls with a gap between the bats and the vapor barrier.
Without insulation, will I have condensation on the room-side of the drywall? It can be very humid here.
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