Can I install a Kerdi sloped shower tray over existing tile


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Old 12-09-22, 11:02 AM
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Question Can I install a Kerdi sloped shower tray over existing tile

We just built & tiled a new shower. Hooked up plumbing & ran water to test it, there are some low spot in the floor that hold water & don't drain properly. Would REALLY like to go over the top of it without having to rip everything off the floor. Wondering if I can install a Kerdi sloped shower tray over existing tile then re-tile on top of that?
 
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Old 12-09-22, 11:15 AM
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The short answer is no.
 
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Old 12-09-22, 11:31 AM
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Old 12-09-22, 11:35 AM
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Buy a squeegee.
 
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Old 12-09-22, 01:09 PM
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Yeah I tried that first. Unfortunately we used the round mosaic tiles so they slope right in where it's too low & it's like a little pool of water. I'm worried long term it will be a bigger problem.
 
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Old 12-09-22, 01:22 PM
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Rip up the low tiles and replace them.
 
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Old 12-10-22, 02:32 AM
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Not much you can do but replace them.
 
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Old 12-10-22, 06:09 AM
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The question is not "can you tile over tile".

There are multiple reasons you would not install the kerdi system in your situation, not the least of which is that you cannot JUST add a sloped kerdi tray, you would need to do the walls too, or at least tear the existing tile off the walls in order to add the pan as part of a repair, since it is a complete sealed system. You cannot just do the pan, thinking you won't need to disrupt any tile. And you would need to completely redo the drain.

So sad to say, you don't even want to go down that road unless you plan to start over. If the problem is a small dip, fix the dip.

The alternative is to completely cover your existing tile floor and walls with the ENTIRE kerdi system, which will include redoing the drain and extending your shower valve for the additional thickness. Which is a little extreme when all you need to do is fix a dip.
 
 

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