XPS Instead of Drywall
Hi, I’m remodeling an attic in a brick house. The outside is insulated with graphite EPS (4″ thick). I’d like to add an inch of XPS boards on the inside for an added insulation and air tightness. My understanding is that it would hold the air inside the house, but also stop water vapor from escaping. My biggest concern is mold. The vapor and stale air would then be ventilated through heat recuperator with a limited heat loss.
I do not intend to put up drywall. I don’t see the point. Vinyl netting would be glued (cement based adhesive) to the outside of the XPS, creating a uniformed wall structure, then the glue layer would be finished with polymer coating. I could add some latex paint for the bathroom or a waterproof wallpaper.
Are there any holes in my reasoning?
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