Insulating the interior of a basement wall that has existing 1″ foam board on the outside of the wall
I plan on finishing off the basement of a 1970s house. This house has poured concrete walls with 1″ XPS foam board on the outside of the basement wall (down to the footings) with foam also on the rim joist. Will installing 2″ XPS on the inside wall and rim joist cause problems?
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