Rim joist insulation
I insulated and air sealed my rim joists using 2 and 3/4 inches of polyiso along with one part foam around edges plus an inch or a bit more of mineral wool to get me to my target of R20+. I covered the insulation with 1/2 drywall for a thermal barrier and caulked the top and side edges as well as around plumbing penetrations through the drywall. I did not caulk the bottom edge (at least as of yet) as it is hard to get a caulk gun to the area. This edge is screwed tightly against the sill plate. Given this construction, do I have any condensation issues to worry about? I live in zone 5 (NH).
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