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Unread 01-06-2021, 10:23 AM   #5
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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Mike, the "steam" you're seeing in the bathroom is not the moisture vapor that is going to penetrate your drywall into the cooler spaces toward the exterior of your structure. The vapor that will penetrate those surfaces you cannot see at all.

A couple heavy coats of good latex paint on the inside surfaces of your drywall ceiling is usually a sufficient vapor retarder in that application. Removing that visible moisture quickly helps a good deal, too, of course, lowering both the temperature and humidity that are causing the vapor drive in the room.
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