Reply: use closed cell foam, skip the vapor barrier.Bathrooms are a particular source of indoor moisture, even in usually-dry Arizona where a long hot steamy shower in a comparatively cooler bathroom can produce condensation on walls, floors, ceilings. ...
In a really, really cold climate, itmaymatter, but even in Maine and Ontario, vapor retarder paint would be a better way to go. If you want to slow down the vapor diffusion, why not do it before it hits the drywall? So just relax. If your building inspec...
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