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Old 06-01-2010, 07:39 AM   #1
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Regrouting porcelain


I just had a new shower installed. The floor is made of 2x2 porcelain. The grout lines look normal, but when you step on it barefoot, you can feel the edges of the tiles, which are slightly sharp. Is it possible to regrout over the existing grout, which is epoxy, to raise the grout line more flush with the top of the tile?

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Old 06-01-2010, 04:17 PM   #2
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Regrouting porcelain


That won't work at all.
What is under the tile?
What type of substrate was used?

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Old 06-01-2010, 04:33 PM   #3
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Regrouting porcelain


It was installed on top of a kerdi shower system floor. It's not worth ripping up the tile, does grout not stick to cured grout?
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Old 06-01-2010, 05:23 PM   #4
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Regrouting porcelain


Quote:
It was installed on top of a kerdi shower system floor.
But what is under the KERDI? Is it a KERDI Shower Kit, meaning a Styrofoam pre-sloping base, or was the KERDI installed over a concrete slope? It can make a difference.

In normal cases grout does not stick to cured grout (for very long). In the case of epoxy grout, it would be best to gouge the existing grout and then reapply more epoxy grout.

If you could answer the questions it would be helpful.
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Old 06-01-2010, 10:00 PM   #5
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Regrouting porcelain


Oh, it's on top of the foam pre-sloping base. Sorry I left that out...
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Old 06-04-2010, 10:50 PM   #6
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Regrouting porcelain


Any ideas?
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Old 06-04-2010, 11:04 PM   #7
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Regrouting porcelain


Well I've seen this once before.

I used two inch porcelain tiles on a Schluter foam base. The owner/customer stands about six foot-three and weighs-in at around two hundred-sixty pounds. The grout cracked exactly where he was stepping into his shower every morning.

Any of this sound familiar to you?

If the foam hasn't compressed and the tiles aren't loose, you could dig out the broken grout and regrout, but obviously this isn't a permanent fix unless maybe you change your habits a little.

I've not heard of any issues with those Schluter Shower Kits with my one exception. I wonder if you are the second exception.
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Old 06-04-2010, 11:21 PM   #8
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Regrouting porcelain


I am only 160 pounds :P The problem isn't cracked grout, it's that when the grout was originally installed, i just don't think enough was put in. I'd like the grout lines a little higher.
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Old 06-05-2010, 09:11 AM   #9
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Regrouting porcelain


In normal cases grout does not stick to cured grout (for very long).

In the case of epoxy grout, it would be best to gouge the existing grout and then reapply more epoxy grout.

Keep in mind that immediately below the tile is where the waterproofing membrane is located in this shower. Don't damage that membrane.
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Old 06-05-2010, 09:17 AM   #10
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Regrouting porcelain


When you say gouge, do you mean remove? Or just rough up?
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Old 06-05-2010, 09:40 AM   #11
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Regrouting porcelain


Quote:
When you say gouge, do you mean remove? Or just rough up?
Remove.
Remove about 2/3's deep. A heat gun will soften the grout for removal but don't over heat anything also because of the waterproof membrane just below the tile.
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Old 06-05-2010, 09:48 AM   #12
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Regrouting porcelain


I have a feeling I'll either hire someone or get used to it.

Would a tile guy charge an arm and a leg for something like that? They are 2x2 tiles, so might be time consuming.
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Old 06-05-2010, 09:53 AM   #13
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Regrouting porcelain


You say this is a new shower. Why not call the installer back and have him do it right?

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