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Old 10-27-2017, 06:52 PM   #65
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 12,416
Thinset will stick to thinset, but the bigger question is how much is there between the sheets on the seams? That cannot be a huge amount. A thick layer of thinset may mean trying to keep the tile perfectly in the desired plane may be tough to impossible and could allow some moisture to wick much further than if the sheets were closer together with the 'proper' amount of thinset. I was told in the class that it is the fleece's fibers on the two sheets that are close to each other are what disrupt the seepage of moisture, and make the seam waterproof.
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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