01:43AM | 04/03/07
Member Since: 04/02/07
1 lifetime posts
Hi, I just had a new ceramic tile floor installed in my Kitchen, Dining Room and Bathroom. The grout keeps cracking in certain areas of the Kitchen. The Tile was placed over wonderboard which was placed over vinyl tiles. Thinset was used to hold down the tiles. Where the grout is cracking I hear a crunching sound almost like eggshells when I walk on it. My friend who laid the tiles insists that the tiles were laid with pleanty of thinset and are not loose. We think it may be possible there is movement on the floor and may need to resupport the floor joints. How do I do this? I have a crawlspace and can get to the joints but how do I know that this is the problem? Any help would be appreciated.

Thank you,



12:36PM | 04/03/07
Member Since: 10/28/05
312 lifetime posts
the problem may be one of the following, or more than one working together to create your failure:

you installed over resilient tile. that is a BIG NONO! Rip out any resilient product and flooring grade underlayment down to the substrate/subfloor.

The cement board needs anchored in a bed of thinset and anchored with roofing nails or screws. If this was not done, that coud be the issue.

subfloor thickness (the subfloor under the vinyl/underlayment layer) needs to be at least 5/8", preferrably 3/4" or more !

deflection of the joist framing needs to be within L/360. This is based on your joists span, size, and construction. Use this handy calculator to decide for you:

I hate to say this, but it sounds like it all needs ripped out and redone becasue something underneath is making it fail.


There are two ways to do any job.

The right way and the wrong way.

Do it right everytime.


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