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Old 06-06-2015, 12:39 PM   #1
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Big Ditra mistake

Help! We put down ditra on modified thinset over wood subfloor in our bathroom. We have hills and valleys maybe from kneeling on. They make it look so easy on-line. We pulled up the ditra a few days later and tried to chisel the modified thinset in order to start over. This was online recommendation This stuff isn't coming up. What do we do now? Our tile (ceramic long pieces that look like hard wood 5 inches wide) requires unmodified thinset. Can I put tile with unmodified right on dried modified thinset and forget the ditra. Start at highest point and make sure other tiles have enough thinset to meet the first.

What's a girl to do


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Old 06-06-2015, 04:22 PM   #2
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Big Ditra mistake

Definitely don't just go over the plywood. A diamond cup wheel will make short work of any residual thin set left on the plywood and you can start over.


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Old 06-10-2015, 05:15 PM   #3
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Big Ditra mistake

Sorry you're having a problem, young lady. I don't see how dimples from kneeling can cause a problem that would hamper the installation of tiles unless the floor was not flat in the beginning. Are you sure those are not air pockets? You have to start with a sturdy flat floor and your selection of tiles require a very flat base.

You can not do as you describe. Porcelain tiles over Ditra set with a high quality unmodified is right. If there's no Ditra, you'll need to use a modified thinset. But Tile without a Ditra type membrane or concrete backer is not a good plan.

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Old 06-10-2015, 05:53 PM   #4
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Big Ditra mistake

I agree with Jaz and that was my first impression. Either the floor had strange irregularities to begin with, or you didn't step on the floor enough - i.e. you have bubbled up areas.

Thinset isn't really tough stuff like grout or concrete, so you should be able to get it up with standard techniques - multi-tool, grinding wheel, etc.

Sounds like you have faux-wood tile planks. You are going to have a hard enough time avoiding lippage with those long tiles as it is. You want a very flat surface to begin with.
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Old 06-15-2015, 06:53 AM   #5
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Big Ditra mistake

Yeah to what jeffnc said. It's all about having the right tool. I used a Dremel Multimax with a scraper blade to remove thinset and adhesive from my bathroom subfloor. A grout removal blade would probably shave it right out too. It will take some work, but you can get it out.

Another option is to put an "gig" ad on Craigslist. Someone with the right tools could make short work of it and you could can get back to work.

Good luck.

Last edited by costgeek; 06-15-2015 at 06:55 AM.
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Old 06-24-2015, 02:40 PM   #6
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Big Ditra mistake

A hammer, a chisel, and some armwork really, really should do it.


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ceramic tile , ditra , mistake , thinset thickness

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