do i still need to do airsealing detail between bottom plate and slab besides sill sealer if going with open cell spray foam cavity insulation?
Framing tomorrow! Need help making a decision whether I should still take the time to apply acoustical sealant sandwiched between sill sealer and bottom plate and sill sealer and slab foundation if we are going to do open cell spray foam cavity insulation on our 2×4 wall studs? I was just told today that OC spray foam when applied greater than 3 inches is already an air barrier. Is that true? Please help, anyone. I already bought the acoustical sealants and caulking gun but would rather skip this step if it is already unnecessary.
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