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Unread 04-28-2008, 05:20 PM   #2
Tampa Florida Tile Contractor
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Join Date: Oct 2007
Location: Tampa, Florida
Posts: 26,508
most tile installers don't like to install anything over drywall compound.
but you can prime it and go over it with thinset.

you will be using a unmodified thinset behind the Kerdi so you want the thinset to slow cure with moisture to make stronger.

I don't think the plastic barrier needs to come down since when Kerdi is done correctly there will be no moisture getting behind the wall.

others here may have more insight on the barrier for you.

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