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Unread 06-20-2019, 08:00 PM   #12
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Join Date: Mar 2011
Location: Michigan
Posts: 69
I took down the drywall and framing for the niche and was surprised at the condition of the drywall which was covered by kerdi. I put the kerdi up 4 or 5 days ago. The drywall obviously absorbed all the moisture from the thinset. The back side of the wall is open, so it's not like it was trapping humidity in there. It isn't mushy, but is fairly friable and looks like styrofoam. Is this normal? This is the only wall in the shower that has drywall, as I ran out of Durock and had this on hand. I was going to replace it with the other half of the drywall sheet, but now I'm thinking that might not be a good idea.

The photo is of the back side of the removed drywall.
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