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Old 01-29-2014, 04:26 PM   #1
crackrx
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Kerdi Shower pan - slope issues

I installed a kerdi shower pan, but the existing floor was out of level, sloping away from the off-center drain. I used thinset to build up the side that was pitched incorrectly. The problems began, when in my haste to get kerdi fabric on the wall I was stepping on the freshly set shower pan. It caused the intersection of the two pre-pitched foam pieces to sink. I did not notice until after I had all the kerdi fabric on.

My question is, what is the best way to go about correcting the dip and improper pitch. Can I use deck mud over the kerdi, and then apply another layer of kerdi? Can I try and level it out using thinset, and then apply tile after that. Any help would be much appreciated.

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Old 01-29-2014, 05:18 PM   #2
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To a certain extent, a medium bed thinset may correct the problem. Regular thinset is limited to about 1/4" build up.....
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Old 01-29-2014, 05:29 PM   #3
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I am seeing conflicting things. Is Ditra set considered a medium set or a thin set? If medium set would Ditra set work?
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Old 01-29-2014, 05:37 PM   #4
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Ditra is NOT a "morter." It is an isolation membrane...........
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Old 01-29-2014, 05:43 PM   #5
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Gotcha, but I was referring to Ditra Set mortar, by bostik.
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Old 01-29-2014, 05:47 PM   #6
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Nevermind, found the spec sheet for it. It says "Portland cement thin set mortar and Medium bed mortar for schluter -ditra uncoupling membrane"

So that should be good to go, right?
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Old 01-29-2014, 05:49 PM   #7
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According to my Schluter rep, Ditraset is a medium set mortar
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Old 01-31-2014, 01:00 PM   #8
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Why don't you just tear that foam tray out & float a pan using deck mud. Trying to create a slope with thinset mortar sounds like going from bad to worse. As the saying goes...Haste makes waste...
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Old 01-31-2014, 01:20 PM   #9
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Welcome, Casey.

What Jim said.

All bonding mortar manufacturers in the ceramic tile industry, and the industry itself, specifically state that thinset mortar (including medium-bed) are not to be used for leveling or truing the substrate.
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