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Unread 04-28-2005, 12:00 PM   #1
trout
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thinset-ditra-thinset-tile = total height?

I plan on laying ceramic tile over concrete. I'm trying to figure out what the total height increase will be.

unmodified thinset using 1/4" V-notch = 1/4 height increase
Ditra = 1/8" height increase
unmodified thinset using 1/4" sqaure = 1/4 height increase
tile = 1/4" height increase.

So will the total height of the flooring be 7/8"? Or can I expect the thin set layers to NOT add a full 1/4"? If the thinset will compress, how much will it compress.

BTW- my name is Chad
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Unread 04-28-2005, 12:06 PM   #2
jay f
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The thinset will smush (Yes, it's a technical term ) down to an eighth or less. You are probably looking at approximately a total on 1/2" increase, give or take 1/16 or so.
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Unread 04-28-2005, 12:12 PM   #3
reglilly
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I may be math-challenged, but ...

I come up with 5/8" +/- 1/16.

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Unread 04-28-2005, 01:06 PM   #4
bbcamp
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I agree with Jay. The 1/8" for the Ditra includes the thinset bonding it to the floor. The 1/4x1/4 notch will yield a little less than 1/8" for the thinset between the Ditra and the tile.
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Unread 04-28-2005, 02:55 PM   #5
hernon_m_t
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Hi Trout,

Thanks for this post. I am doing the same thing as you: thinset + ditra + thinset + tile (I have a 3/8 ply base as well over osb).

When are you laying the ditra? and the tile? I am looking for feedback on the process.

Thanks,
Matt
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Unread 04-28-2005, 04:10 PM   #6
reglilly
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Hi Matt -- if your looking for feed back on Ditra experience, no need to wait for trout -- do a search of threads on Ditra and you find a ton of discussions on almost every conceivable Ditra experience.

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Unread 04-28-2005, 04:33 PM   #7
tileguytodd
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I use 9/16 " day in and day out for this combination (just did 30 motel rooms in 2 seperate motels in the last few months using this figure)
It seems to work everytime.some floor tiles are coming in a tad heavier than a finished 3/8" so watch your tile.
Remember, mix your thinset a bit on the loose side for the ditra and either roll it in with a floor roller or use a grout float and your weight to smooth it in.Keep a low angle on the trowel(or use a well worn trowel like i do) a brand new 1/4" trowel at a 45 degree angle leaves too much mud under the Ditra In my opinion.
I'm sure schluter would rather see more mud than less but it makes getting it nice and level tough with too heavy a mud bed.
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