Can I put a breathable peel and stick weather (air) barrier on the inside walls and ceiling?
Here is my problem: I have polyurethane spray foam inside the assembly cavity of my walls and unvented flat roof ceiling. It's impossible to air seal all the joints and sistered joists with caulk or sealant because where the SPF meets the joints, the seam is thin and air goes right though the SPF and enters the joints....