Ditra:can I Make Up 3/16" Difference Between Old & New Floors W/ Thinset Under Ditra? - Flooring - Page 2 - DIY Chatroom Home Improvement Forum

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Old 04-09-2010, 04:58 PM   #16
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Originally Posted by Bud Cline View Post
ALSO, did you know that granite tile is thicker than most ceramic tile? Granite tile will be 3/8" thick. Personally I don't think you will have as much variance as you say you will.

Use a cheap caulk to fill the plywood gaps.
I'm not sure about what you're saying in the first point. My granite tile is going on both the old underlayment/subfloor and the new underlayment/subfloor - perhaps you thought it was going on only the new subfloor/underlayment?

I am clear on the issues about mortar (see my message which immediately precedes this one).


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Old 04-09-2010, 05:03 PM   #17
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buds the man, he may have meant with the thickness of your bed under the tile most of your variation will be resolved
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Old 04-09-2010, 08:22 PM   #18
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There will be added thickness from the thinset used to install the DITRA, hard to say exactly how thick.

There will be added thickness from the thinset used to install the tile, hard to say exactly how much.

The tile will be thicker than standard ceramic tile by about 1/16". I'm sure you'll right were you need to be when all is said and done. If not...you can always fudge the tile a little if need be.

Plywood does not get taped, only use caulk to close the joints and keep thinset out. DITRA does not get taped, unless you are waterproofing it. To waterproof DITRA seams, KERDI Band is applied using thinset.
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Old 04-26-2010, 10:36 PM   #19
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An update on regarding using slightly more thinset under Ditra to make up a small difference in height of 2 subfloors (I asked about this earlier in the thread): I installed the Ditra before the reply about small humps resulting if you do this. In fact, that's what happened. I think if anyone tries use extra thinset under Ditra as I did: (1) think hard about using self-leveling compound (I guess I could have done that although there were reasons why it could have created its own problems); (2) if you do it, really press down with the float to try to get the thinset spread out well under the Ditra; (3) do NOT walk or place anything on the Ditra after step (2) until the thinset is set up. I DID do the skimcoat of thinset & let it cure before the installing the Ditra - but I must have gotten my thinset too thick when installing the Ditra.

The humps haven't been a particular serious issue, although I did decide to go with the trowel with the deepest teeth recommended by Schluter. (Disclaimer: this is based on my one experience with using Ditra & installing granite tile). I also finally tracked down a dealer that could get Kerabond for between the tile & Ditra.


Last edited by lazzlazz; 04-26-2010 at 10:40 PM.
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