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Old 03-19-2018, 07:05 PM   #1
ShaneAlbert9
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Need some advice on Kerdi Shower Base problem!

I recently finished the installation of my Kerdi shower system. Overall, pretty pleased with the result until today. Went back to my renovation to prepare to do the water test and threw a level on the floor. Should have done this the night of the install but honestly at about one in the morning was pretty trustworthy of the pre sloped base. I notice now that it doesn’t have much slope in some places. Some places it has plenty. It also has some unevenness to it or “bumpy” maybe from me when installing the corners. Can I apply a layer of thin set over the whole thing to add slope where needed or is there a better solution?

Thanks in advance!

Shane
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Old 03-19-2018, 08:03 PM   #2
jadnashua
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The foam pan will bend to follow the existing floor, so if the floor isn't flat, the pan won't have the desired slope.

Yes, you could float some thinset on the top of it prior to adding the membrane. But, if it would be successful would depend somewhat on how thick it needed to be. Thinset is not designed to be a leveler or applied very thick.
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Old 03-19-2018, 08:35 PM   #3
ShaneAlbert9
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And that could be the case. Though we replaced a section of the subfloor under the shower and I believe we had it level. What I wonder about is if after laying the Kerdi, I put cardboard down and installed the corner pieces and perhaps me moving around on it threw it out of whack. Most places it will run off water just fine, however other places nearly slope away from the drain. Would there be an alternative to using thinset? Possibly mud bed over the Kerdi and re applying another layer of Kerdi?
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Old 03-19-2018, 09:10 PM   #4
Lou_MA
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Jim - I think the kerdi is already down.

Shane - there’s no feasible way to do a mud bed on top of that layer of kerdi you have now. How to bond it is one question. Plus it would add quite a bit of height. And give you two layers of waterproofing for moisture to potentially get trapped.

If I was in your shoes, I’d be tempted to flood test what you’ve got and make sure it’s watertight. Then use thinset to float out the few areas that have no pitch, and then tile the floor. The grout joints in the floated areas may remain wet / darker longer than the surrounding areas but the advantage of kerdi is that it’s right below the tile so there shouldn’t be a whole lot of moisture anyways. Now if you’re talking about floating out the whole pan, or large portions of it, that’s another story.
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Old 03-19-2018, 10:06 PM   #5
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If you just had a divot in the pan from setting your knee on it, or something similar, I'd say fill it and go. If you have an entire section that is flat, I can't see how you'd make that work.

I don't think you'd like my suggestion.
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Old 03-20-2018, 01:18 PM   #6
jadnashua
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FWIW, when working with anyone's foam pan, it's a good idea to kneel on a rigid kneeling board so you don't put divots in the pan. Once you've installed the tile, they spread the load, and it's no longer a problem with any conventional load you may have in there, but prior to the tile, yes, you can make a depression in the foam. The layer of Kerdi helps make it more rigid, but it's the tile that really finish that off.

The slope on those things is quite precise, but that also requires the subflooring to be level, too. That's where a mudbed can be advantageous...it can overcome any of those irregularities. If your surface is good, the foam pan does work quite well, though, and is super fast to install and then finish off the shower.
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