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Foam board options for basement walls – GreenBuildingAdvisor
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Expert Member DCcontrarian | | #3
I did InsoFast in a basement powder room, mostly just to see how it works. Pros are it’s fast and easy. Cons are it’s expensive and it doesn’t meet energy code, it’s just R8.
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Expert Member
DCcontrarian | | #2
To get R15 with 2.5 inches you need R6 per inch, which means polyiso.
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Expert Member
DCcontrarian | | #5
You may have to go to a roofing supply store or a building supply store.