28 Jul '12, 2am

Green Building Q&A: How to insulate a basement wall rim joist that is an inaccessible "cavity"?

On my addition being built, I have the first floor joists resting on the poured concrete basement foundation walls. The basement walls are 10" thick with the sill plate 8", to leave the typical 2" strip of exposed concrete along the top of the wall (not covered by the sill plate). I was planning to place rigid foam over that exposed concrete and along the sill plate and rim joist and then complete with air-permeable insulation (mineral wool), as often detailed at GBA and BSC. The problem I have is that along one side, the framers placed the second joist only 10.5" in from the rim joist, so that it almost touches the inside face of the wall. This now means I cannot access the cavity that is formed by the top of the basement wall below, the two joists on the sides, and the plywood subfloor above. How do I insulate? I have insulated the basement internally with 3" foil-faced ...

Full article: http://www.greenbuildingadvisor.com/community/forum/green...

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