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Old 03-08-2018, 10:12 PM   #9
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 12,409
From what I can tell, only two companies have paid for the tests to certify their sheet membranes will work over drywall - Schluter and Laticrete.

So, since that is required to actually be considered a valid installation, you could be in for problems. I'm not saying it won't work, but if an inspector actually knows and understands the stuff, it could fail because it wasn't installed per the instructions over a certified backer.
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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