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Unread 05-27-2013, 07:08 AM   #1
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Overlapping moisture barrier above tile line?

I recently ripped out a 5' fiberglass shower only to find some mold in an exterior studwall. When I built the home 12 years ago, the insulator did not put a moisture barrier in the space above the shower, which is an exterior wall. I attacked the mold with bleach and then brushed it with a borax solution, both of which helped.

I'm now installing a Schluter pan with Kerdi on the walls. I've read not to create a "moisture sandwich" and only rely on the Kerdi over the substrate. The problem is, I was only planning on running Kerdi and tile 72" high and my ceilings are 8'.

Should I put poly behind my drywall above my tile line? Do I run the risk of moisture collecting on the poly only to run down into the open studwall? I know I don't want two layers of moisture barrier, but I also don't want to create additional problems with this method. I almost think I'd be more comfortable putting all poly behind on the studs and just using Durock.

Any help is much appreciated.
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Unread 05-27-2013, 07:59 AM   #2
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Generally, you'll overlap your poly about 6" behind the area where you start the kerdi. In cases where the fiberglass units are installed correctly, you'll see the same thing.

I will say that 72" seems a little low, considering that most showerheads are put in at 78" or so and splashing happens.

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