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Unread 09-12-2019, 12:10 PM   #1
cataan
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Using Kerdi on concrete slab rather than Ditra

Hi everyone -- was hoping to get some advice from you Kerdi vets and pros.

I am removing some tiles and slate from a floor due to cat urine residue. Enzymatic cleaners have cleaned all they can, the smell remains and some has gotten down into not only the thinset, but also the concrete slab (I've removed the thinset).

Since I'd only be removing a portion of the tiles/slate, I can't use Ditra because that would create a floor height differential. Kerdi, however, adds negligible height, so I thought I would use it to prevent the smell from transmitting up into/through the new tiles and grout lines. And if it doesn't work as well as I'm hoping, other than cost I don't see a downside.

I don't know what I don't know so would appreciate your thoughts!

Thanks!
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Unread 09-12-2019, 07:39 PM   #2
Tool Guy - Kg
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Kerdi isn’t rated for that.

But maybe consider Nobleseal CIS. It’s only 1/16” thick, is rated for such use, and has a spectacular perm rating.

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Unread 09-13-2019, 08:52 AM   #3
cataan
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Thanks Tool Guy

When you say not rated, is that in reference to the perm rating - I know Kerdi DS has a much lower perm rating (steam showers) but is really expensive. Will take a look at the Noble product - thanks!
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Unread 09-13-2019, 10:52 AM   #4
Tool Guy - Kg
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I mean that Kerdi isn’t designed or rated to be installed over a concrete slab on the floor.

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