Air sealing sill plate while allowing permeability
Have an older home, with the lower level 4′ below grade, zone 5. Currently remodeling, sill plate sits directly on the stem wall (no gasket), which is pretty much at grade level (some grading will occur, but not possible everywhere).
Before I build my interior wall, which will be a challenge, as I need to meet U<0.45, there is vapor barrier on the exterior, and some occasional moisture (no bulk) in the wall. Question is — what’s the best way to air seal the sill plates at the stem wall? Ideally it would be an air sealing material (tape, caulking, foam etc) that is permeable. Are there any recommended air sealing products that are permeable?
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