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Unread 10-08-2019, 11:09 AM   #1
Don Diver
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Need Help - Kerdi membrane issue

I had about half my tile floor come loose. I pulled up all tile that came out easily and have discovered several spots in the kerdi membrane that are loose and not attached to the pan. Looking for ideas to fix.

Thinking I can cut a slit and reattach membrane to pan, but there is a lot of thinset on the membrane, so I am not sure I can patch the slit.

I am wondering if I can paint the whole thing with RedGaurd after I get the membrane attached?

The bad thing - I have completed 3 other bathrooms in the house and this is the only one I hired a professional.
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Unread 10-08-2019, 01:02 PM   #2
speed51133
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if you hired a pro to do it, why are you fixing it?
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Unread 10-08-2019, 06:03 PM   #3
Don Diver
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If it wasn't done right the first time, I am not going to get the same guy to try and fix it.

Don't want to have to pull all the tile up and start going up the wall to seal the pan if possible.
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Unread 10-08-2019, 06:10 PM   #4
Tool Guy - Kg
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Can we get some details? Like, how long have the tiles been down? And do you know exactly which mortar was used? And could you show us a picture or two?

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Unread 10-08-2019, 06:26 PM   #5
Don Diver
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Shower pan tiles. 2x2 tavertine. Down about 10 years. Grout failed. Looks like it was very dry when installed with lots of air pockets between the tile. Mortar would have been unmodified thinset from tile store.

Kerdi membrane has several air pockets and is loose in a couple places. Much of the thinset is still on top of the membrane, so I am not sure I can cut out loose pieces and put down a regular kerdi patch. I will try and get some pictures uploaded asap.

Thanks,
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Unread 10-08-2019, 08:35 PM   #6
Kman
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It's very difficult to repair Kerdi that's already covered with tile. It's especially difficult to do an effective repair on a shower floor.

It's the inability to make any sort of an overlap that's needed to ensure that it's waterproof.
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Unread 10-08-2019, 09:17 PM   #7
Don Diver
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Loose section next to drain is about 3-4 inches wide.

Loose section in middle of floor is about 3-4 in. wide and 6-7 in. long.
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Unread 10-08-2019, 10:09 PM   #8
jadnashua
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If all of the tile that were loose started around the drain, I'd want to look to see how big of a hole they put in the subflooring! If it's much bigger than the nominal 5" OD, or the subflooring is compromised, the flex there could cause enough movement to loosen the tile.
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Unread 10-08-2019, 10:23 PM   #9
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With it lasting that long and then failing, I'd be looking for the reason that it failed.

When you say the grout failed, did it crack or come out in places, or something else?
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Unread 10-09-2019, 07:40 AM   #10
Don Diver
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Jim

The tile that came loose first was at the other spot in the middle - not close to the drain.

Kman

The grout started failing about 3 years in. I started patching grout. (probably should have ripped it out then and replaced).

The subfloor hole is about 5 inch and solid from below.
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