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Unread 08-31-2006, 03:19 PM   #1
Scottish Tile and Stone
Ohio Tile Contractor.. Hydroban shower specialist
 
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Thinset didnt stick to fiberrock.

I was asked to go do a tile repair. When I got there I noticed the grout had cracked. I thought it was cracked on the subfloor seams. I tried pulling up the first tile, and almost EVERY tile came with it. The only thing that was holding the tile together was the grout. Hardly any thinset was stuck to the fiberock. Do you think the installer used cheap thinset? I will post up some pics in a few..
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Unread 08-31-2006, 04:47 PM   #2
kevjob
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yeah that and no burning into cbu
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Unread 08-31-2006, 06:40 PM   #3
duneslider
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Could have been overly dry thinset or wet fiberrock.

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Unread 08-31-2006, 06:45 PM   #4
Davy
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I'm with the others, cheap thinset probably mixed too thick.
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Unread 08-31-2006, 06:56 PM   #5
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I've also seen contractors put down CBU way to early in construction. Mud drywall dust etc everywhere. if it's not mopped well, nothing will stick to it.
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Unread 08-31-2006, 07:08 PM   #6
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The shop I work through uses Fiberock. Every time I have had to pull up a tile I have been impressed on how well the mortar has stuck to the Fiberock. Something must be up.


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Unread 09-09-2006, 04:06 PM   #7
Scottish Tile and Stone
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Here are the pics of the subfloor. I didnt have to scrape anything off.
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Unread 09-13-2006, 05:14 PM   #8
kevjob
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how was the coverage on the tiles? was the thinset all powdery?
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Unread 09-13-2006, 06:48 PM   #9
Scottish Tile and Stone
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Backs of the tile looked evenly covered. Almost like you just flat trowled the tiles..
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Unread 09-13-2006, 08:02 PM   #10
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Wow! if the floors that way, what about that shower to the right
Tile on ...
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Unread 09-13-2006, 08:39 PM   #11
Scottish Tile and Stone
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My thoughts exactly.. I should just go ...
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Unread 09-13-2006, 08:47 PM   #12
igneous
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looks like a back buttered/dusty floor combo. maybe dry thinset on top of that. It's either that or the tile gods are really, really mad at the installer. I'd call and ask but I've used my lifeline for the week.

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Unread 09-13-2006, 08:49 PM   #13
Scottish Tile and Stone
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Im leaning more towards cheap hack..
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Unread 09-14-2006, 07:30 AM   #14
EEEO
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I'm not noticing any taped seams either.

I tore out 3 rooms about a month ago that were the same way. All the tile had debonded from the Fiberrock(that's to say it bonded in the first place), and there was no mortar to scrape off of the rock. The problem there wasn't mortar though, or at least not entirely mortar---there was no thinset under the Fiberrock. Tore it all out and the new floors are sitting on Ditra.
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Unread 09-14-2006, 08:32 AM   #15
Dave Taylor
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Scott......

Whatever else it could be...... it does sounds like what Kevin said. Mebee the tiles were back buttered only with a flat trowel....then laid.... and thinset had never been applied to the floor... let alone burned in.
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