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Unread 12-01-2011, 11:16 AM   #6
HooKooDoo Ku
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Join Date: Mar 2011
Location: Birmingham, AL
Posts: 768
As a DIYer, it looks to me that someone go creative and used styrofoam as a waterproof layer, with CBU at the bottom to support the walls of the shower pan.

Obviously this is just a guess, but it makes some sense. Haven't you ever used one of those cheap styrofoam coolers you can get at the store for something like $2? Do they leak as your ice melts?

But in any case, it sounds like a tear-down to the studs and do-over on the walls.
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