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Old 09-26-2009, 10:26 AM   #31
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help! why do the tiles in my bathroom crack?


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Originally Posted by Bud Cline View Post
If the above is a reference to Custom's "Easy Mat" - Forget it.
nope, not easy may. durock membrane

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Old 09-29-2009, 05:35 PM   #32
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help! why do the tiles in my bathroom crack?


you rock.... thanks so much for your input. Becuase of everyone's recommendations, I will definitely put in a ditra mat... and I'm much more hopeful that the crack is not due to a major slab issue.

I'm sort of envious of your job.... I think I missed my calling. More interesting than labwork... You solve difficult problems and aren't stuck in the same room day after day! then again, physics was never my strong point, so I likely wouldn't be a very good engineer... but I digress...

thanks again.....


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Originally Posted by Daniel Holzman View Post
This is an interesting, fairly common case. I used to do forensic investigations on structural damage, and I looked at about half a dozen tile failure problems in the southeast.

In cases where the slab has seriously cracked, you are most likely to get a large crack in the tile. Specifically, what you have appears to be a non-displaced hairline crack. The next size up in the world of cracks is a crack approximately the size of a credit card. You are nowhere close to that, so I discount the theory that the slab is significantly cracked. By the way, all concrete slabs crack, the issue is how much, and how significantly, they are cracked. At this point, I would say there is no evidence that your tile crack is due to slab failure.

I observed two cases where a "tenting" type failure, as noted by Bud Cline, had occurred. In both cases, there was an obvious hollow zone in the center of the floor. The tiles had literally detached from the thinset. In one case, the failure was traced to an improperly mixed batch of thinset, which had not properly adhered to the tile. In the other case, the failure was traced to dimensional changes in the house itself due to moisture changes, resulting in stress to the tiles because there was no relief gap along the edges of the tile. The result was failure of the tile at the center.

In one other case I examined, several tiles cracked because water had leaked onto the floor, and had remained there for several days. Apparently the water caused dimensional changes to the grout, leading the tile failure in a localized area. The apparent cause of the failure was that the grout was stronger than the tile, thus when the grout expanded, rather than cracking the grout, the tile cracked.

I don't see any evidence of slab failure in your case. Due to the length of the crack, and the linear nature, there may be a pipe of some sort embedded within the slab.

I like the use of Ditramat as a bond breaker between the slab and the tile, it certainly is a good product and will minimize the potential for future cracking, but may not eliminate the potential entirely. There are other products that purport to act as bond breakers, however I am not familiar with them, and cannot comment on their effectiveness.
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Old 09-30-2009, 01:55 PM   #33
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help! why do the tiles in my bathroom crack?


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nope, not easy may. durock membrane
OK then.......

Does this miracle product have a name of its own and if so...what might that name be?

Jesus, I should have been a dentist.
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Old 09-30-2009, 02:03 PM   #34
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help! why do the tiles in my bathroom crack?


NEVERMIND...I found it. Never heard of it before, Reminds me of Tavy Thin Skin with its secret formula "007 sauce".

Just another isolation membrane flooding the market. If it's anything like the rest of their products it should be a good one.

JUST REMEMBER!!!!! Those membranes work only if the movement is lateral. If the movement is up and down they offer nothing.

Does that $1.59 per square foot include the adhesive?

http://www.dtm4me.com/?s_kwcid=TC|16...S|b|3055685876
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Old 11-01-2009, 10:54 PM   #35
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help! why do the tiles in my bathroom crack?


Just wanted to update...

Our tiles were finally delivered last week, and we demo'ed the floor last weekend. there is no crack in the slab. The cracking was restricted to the tiles, as predicted by several posters. We're relieved. We're putting in a ditra mat before installing our porcelain tile floor.

It's all very exciting :-)

thanks for all of your input!
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Old 11-02-2009, 12:39 PM   #36
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help! why do the tiles in my bathroom crack?


Good news.

Your worries should be over.

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