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. ...
“Plastic vapor barriers really are vapor barriers when things get wet. Not so asphalt saturated kraft paper. And most walls with asphalt saturated kraft paper thank the building science gods for the difference.”
Expert guide to rock-wool insulation, including how it is made, where to install it, how much it costs, and more. Make your home energy efficient and cozy!
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