Alternatives to spray foam and rigid foam board – rim joist insulation
I live in southern CT and would like to add rim joist insulation to an unfinished field stone foundation basement. I don’t want to create a moisture/wood rot issue by putting down fiberglass batts directly against the joists, but I also would like to avoid using any kind of spray foam or spray foam derived rigid foam board – no polyiso, no EPS or XPS, not even any canned spray foam from the box stores. What are my options? Do I have any? Are there non-toxic rigid board insulators that can be sealed with caulk for example? Thanks.
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