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Unread 10-26-2019, 11:42 AM   #1
jackal2001
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Kerdi fix to set tile in a shower on wall

A contractor set about 16 porcelain tiles 4x12 using kerdi fix instead of thinset on a wall in the shower. It was set directly on top of kerdi board. What will happen?
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Unread 10-26-2019, 11:48 AM   #2
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It'd be like setting with mastic. Should be fine. If they don't move after a few days then I'd say just grout em in!

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Unread 10-26-2019, 11:52 AM   #3
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Forgot to mention this is IN a shower.
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Unread 10-26-2019, 12:20 PM   #4
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Kerdi fix is waterproof. As long as the tiles are firmly in place I don't see anything wrong with it.

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Unread 10-26-2019, 12:23 PM   #5
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Grout isn’t waterproof. If these tiles where set directly in the path of water spray...and if the KerdiFix was applied on blobs that left air spaces behind the tile...water could collect behind the tile, then migrate out of other grout lines taking cement or latex (depending on the mortar used to set the adjoining tiles) with it. In other words, a bit of efflorescence or latex migration to the adjoining grout lines.

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Unread 10-26-2019, 04:51 PM   #6
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Damn expensive to use that, though...
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Unread 10-26-2019, 06:48 PM   #7
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KerdiFix cures at a rate of about 1/8" per day from the outside in. The end bond could be 3-4x stronger than mortar, but it will be slightly flexible, and it is WAY more expensive than mortar. If you get full coverage, it should work.
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Unread 10-27-2019, 06:38 AM   #8
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It was not applied like mortar with full coverage. It was applied like you want to glue something just in a wave or v pattern just to stick it on.
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Unread 10-27-2019, 06:57 PM   #9
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The major hassle with this in a wet area is that moisture DOES get behind tile. Having gaps in the adhesive behind it means that it can accumulate. Depending on what the substrate is, and the tile involved, that can allow moisture to leach into the substrate and the tile. Some tile will change color if it gets saturated, and in that case, a mottled, splotchy look. A good porcelain may not, but the accumulated moisture can end up in the walls and create structural problems when it starts to rot things out. It would likely also cause the grout to appear wet where there are gaps or paths for that accumulated water to touch it.

Cement board is not damaged by being wet, but it is not waterproof...what's behind it may not like the constant moisture.
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Unread 10-27-2019, 07:06 PM   #10
jackal2001
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It is not cement based board. All that was used is the orange kerdi board.
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Unread 10-27-2019, 07:24 PM   #11
jadnashua
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Were the screw holes and seams properly waterproofed prior to installing the tile?
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Unread 10-27-2019, 07:29 PM   #12
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I can only assume most were as I wasnt around for all the install.
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Unread 11-02-2019, 04:01 AM   #13
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Is this floor draining properly. Video

Just had tile floor epoxy grouted and don't know if this is acceptable or not. Also the tiles are scratchy so I'm assuming they were never cleaned properly.
This is set on a schluter pan.
https://youtu.be/CR4m413iDXg
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Unread 11-02-2019, 04:39 AM   #14
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I’m pretty detailed on my slopes but I’ve never tested them in the way you have with short bursts of water in different locations.

I’m in agreeance that the water should make it to the drain each time and not sit like that. However I’d also test with more water (a lot more)to see how it behaves. Water tension will always hold a little residual water, but definitely not puddles.

From your video though it does appear to not evenly slope to the drain which raises a flag. Again I’d add more water, like slowly pouring a 5 gallon bucket in and see how those results fair. A residual puddle produced in that way would be of major concern.
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Unread 11-02-2019, 05:01 AM   #15
jackal2001
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Thank you. I didn't want to get water into the edges of the shower.
I can see there are tiles which are impeding the flow of water just the way they are sitting. They have a negative set compared to the tile adjacent to it. Also there is only about a 1/2 inch total slope or slightly more across edge to edge width wise. I don't have a long enough level to go lengthwise.
We are dealing with a contractor nightmare right now. I don't think anything that was done was installed properly.
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