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Unread 11-05-2010, 09:28 PM   #1
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Kerdi screw-up... modified thinset

Folks: apologies in advance if this has been asked before (tried searching but ended up with literally dozens of pages of hits...) so here goes.

Finally got around to putting up Kerdi in a new shower. I've put HaridBacker up on the walls first. First two sheets of Kerdi went up just fine. Went to get another bag and that's when I realized that the 1st bag - the one I used for the panels that are up - was polymer modified thinset. Argh.

What to do now? I realize that Kerdi wants unmodified because the polymer needs air to dry. What I don't understand is that the HardiBacker seems to absorb water like crazy. I used John's and others' suggestion and wetted down the Hardi board 1st and the water at the top where I started dried before I got to the bottom of the panel. So why doesn't the polymer modified thinset dry too?

More importantly, what would you do with this situation? I was thinking about waiting a week or so to tile - would that help?

Thanks for the advice...
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Unread 11-05-2010, 09:29 PM   #2
Scottish Tile and Stone
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You will be fine.. Your warranty is shot. but I wouldnt worry about it.. Carrry on..

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Unread 11-05-2010, 09:36 PM   #3
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Just OOC - what exact brand/type of thinset mortar did you use?


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Unread 11-05-2010, 11:15 PM   #4
Tool Guy - Kg
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Welcome, Mauro.

Yeah, I'd also want to know exactly which thinset you used.

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Unread 11-06-2010, 06:56 AM   #5
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Warranty is not shot. Schluter says to use a thinset appropriate for the surface. You only have to use unmodified for the seams and between the tile and Kerdi.
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Unread 11-06-2010, 07:30 AM   #6
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Thanks folks!

Edthedawg & Toolguy - the offending thinset is Mapei Ultraflex 2. (Yeah, that's it! Blame the thinset!)

As an aside, I'm planning to finish up today (ahem, with unmodified thinset - Kerabond, I think is the other one I have) and then the tiling won't happen for four or 5 days. That'll give the modified panels a week to cure.
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