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Old 11-09-2016, 11:11 AM   #1
heiber
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Is there an issue with the grout on this new tile floor installation

Just completed a remodel with new bathroom installation. In less than a month the grout on the shower floor is showing signs of flaking(?) and discoloring. Is that a sign that the installation was done incorrectly?

I've attached example pictures. All of these were taken with the tile and grout dry.
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Old 11-09-2016, 12:23 PM   #2
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The picture showing a whole row with the flaking leads me to believe you're seeing deflection under the system. Does it feel 'bouncy' when you're standing on it? What is the substrate under the tile?
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Old 11-09-2016, 01:12 PM   #3
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It does not feel bouncy. Forgive me as I may not know the industry terms but it is a poured cement base. It is sloped to the drain although it is not 100% uniform. There isn't any pooling of water but there are some waves in the slope.

Also towards the center of the wide picture you can see more uniform discoloration where it is darker. This does not have the same "edge row" look as the other issues. Is that an issue too?
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Old 11-09-2016, 03:30 PM   #4
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Did you set the tile in thinset (mortar based) or a mastic?

Cracking in a line usually indicates movement.

Were there any cracks or seams in the slab prior to installing the tile?
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Old 11-09-2016, 04:24 PM   #5
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Sorry but I can't answer that question. I am the homeowner and trying to educate myself in order to follow up on the work with the builder and tiler.

Trying to understand if this is a real problem that needs to be addressed which I think is confirmed. And what needs to be done to fix it.
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Old 11-09-2016, 06:24 PM   #6
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From where I sit, on my monitor, it looks as if that's white thinset showing through in the first pic. Perhaps the grout is very thin there and your installer didn't clean the joints very well before grouting and now it's flaking away. Needs to be 2/3's depth of tile for adequate space for grout.
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Old 11-09-2016, 07:13 PM   #7
heiber
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Thanks for the input. So what should / can the builder and tiler do to fix these problems?

Although I am not happy about the cosmetic appearance I am also more concerned about long term durability.

Thank you.
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Old 11-10-2016, 10:04 PM   #8
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Checking again if there are recommendations on what needs to be done to fix this problem. Thank you.
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Old 11-10-2016, 10:16 PM   #9
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Once you find out what methods of construction and materials were used it gives us a little better idea of possible causes. To regrout, at least 2/3 depth of the grout needs removed then it can be regrouted.
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Old 11-10-2016, 10:17 PM   #10
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Is this a wood floor or concrete slab? A wood floor could be deflecting beyond the limits of the tile and grout.

If the tile is cracked or coming out, the only remedy is to stop the movement below.
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Old 11-11-2016, 09:25 AM   #11
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It is a 90 year old bungalow. Bathroom was built in a new dormer on existing subfloor and joists. I don't have a lot of pictures of the installation but attaching what I do have in case that will help determine the installation and scope of problem.
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Old 11-11-2016, 01:42 PM   #12
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That redgard looks really thin.
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Old 11-14-2016, 01:49 PM   #13
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The builder said they are arranging to have the tiler grind out the grout in the affected areas and regrout. Is this only going to mask a bigger problem?
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Old 11-14-2016, 02:17 PM   #14
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Almost certainly.

My opinion; worth price charged.
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Old 11-14-2016, 02:20 PM   #15
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Personally, I find it peculiar that the grout seemed to have "flaked" in a straight line. That's not normal nor random. I think regrouting it is just going to lead to more of the same but I guess it can't hurt to try it because once it cracks again in the same place you'll know for sure that the problem is movement.
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