We're building a new home. Can you put Roxul in the rim joist, then add acoustical seal around the edges and cover with a vapour barrier? Then tuck tape to wall vapour barrier?
that is an acceptable way to insulate the rim joists. The roxul depends heavily on the poly and acoustical sealant to prevent air from passing through the insulation and into your home. The roxul should fit snug against the vapor barrier. Many new home builders are using spray foam in the rims because it is difficult to insulate well with conventional methods. My recommendation is always spray foam in Rims, Cantilevers, and Warm Floors at a minimum.
Do you have to tuck tape the poly to ceiling and sides
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