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Unread 05-19-2016, 05:21 PM   #7
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,914
Kerdi seams work by the close proximity of the two layers in an overlap of the fleece fibers. I don't know how well it would waterproof things if one side was REdgard, unless you applied redgard over the top of the edge of the Kerdiband.

You can get unpredictable results when you mix products.

Generally, not a great idea to waterproof the walls with a surface applied material and combining it with a conventional liner...the lower edge of the wallboard will still be exposed to the mudbed, and now, you've trapped that moisture behind a waterproofing layer.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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