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Unread 11-23-2020, 07:26 PM   #5
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,225
KerdiFIx will work, but it's expensive. You'd need some for the overlap to bond to the tub, but elsewhere, thinset is preferred. For that application, you could probably get by with the smaller tube, but the larger one that goes in a caulking gun may be easier to get a consistent bead. As long as you have enough to spread and embed the membrane, it's fine, though.

Before tiling or applying thinset, make sure to wipe down the cbu, as, especially HardieBacker, it's quite thirsty, and will suck a lot of water out of the thinset making it hard to embed the material. Keep in mind, thinset gets it strength by curing, not incorporates the needed moisture into its chemical structure...the excess (which makes it spreadable) evaporates.
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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