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Old 10-17-2011, 02:19 PM   #1
Redrobster78
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Ditra vs CBU

Hello Gentlemen,

I'm going to be tiling an entry hall which flows into the kitchen so I'm going to tile the kitchen a little bit later. I read the difference betwen the two materials but my question is if I'm working with an OSB subfloor what would be the prefered underlayment? Cost as well as longevity are concerns.

I've only tiled on concrete slabs before so this is a first for me.

Thanks in advance!
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Old 10-17-2011, 02:36 PM   #2
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Hi Rob, Welcome aboard.


Ditra consumes about an eighth of an inch, cement board a quarter. That's one consideration. Otherwise it's up to you: both methods work.
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Old 10-17-2011, 02:37 PM   #3
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Thanks John, I forgot to mention that I'm trying to set the new tile level with a 3/4" hardwood floor. Not sure if that would make a difference?
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Old 10-17-2011, 02:48 PM   #4
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Just gotta measure it to see which one lines up best. Bear in mind that you DO need to bed the CBU in morter before you screw it down.....
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Old 11-03-2011, 10:21 AM   #5
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Durra XL

Gentlemen,

I'm about to use Ditra for the first time and was wondering what size trowel to use on Ditra XL? As well as any other inside tips you'd like to share!

Thanks!
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Old 11-03-2011, 10:33 AM   #6
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Have you downloaded the Ditra Installation Handbook from the Schluter website? Give it a read, then ask about anything you didn't understand.
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Old 11-03-2011, 11:17 AM   #7
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Thanks Bob. I read it over but I seem a little bit confused when it comes to the XL. Am I suppose to use the 1/4 x 3/16 v-notch trowel or the 5/16 x 5/16 V-notch trowel to set against the wood substrate? It's not very clear in their PDF.

Thanks.
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Old 11-03-2011, 11:36 AM   #8
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Quote:
Originally Posted by Ditra Handbook
Using a thin-set mortar that is suitable for the
substrate, apply the thin-set mortar (mixed to a
fairly fluid consistency, but still able to hold a
notch) using a 1/4" x 3/16" (6 mm x 5 mm)
V-notched trowel, 5/16" x 5/16" (8 mm x 8 mm)
V-notched trowel, or the Schluter®-DITRA trowel,
which features a 11/64" x 11/64" (4.5 mm x
4.5 mm) square-notched design.
This gives you three choices, all of them are approved for Ditra and Ditra XL. For setting the membrane onto the subfloor, there is no difference between the two versions.
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Old 11-03-2011, 11:59 AM   #9
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Thanks. Then if I'm laying 12's and 6's what size trowel would I use to come even to a 3/4 wood floor? I read that I would use the same size trowel but is that right?

Thanks again.
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Old 11-03-2011, 12:05 PM   #10
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You use the trowel that gives you 100% coverage without excessive oozage. In your case, a 1/4" x 1/4" x 1/4" square notch trowel should work. Use the same trowel to set both size tile. This trowel will deposit about 3/32" of thinset when you smooosh the tile into it. If you need more, use a bigger notch and switch to a medium bed mortar.
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Old 11-03-2011, 12:37 PM   #11
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Smile

Thanks Bob for all your help. I just remembered I have "Tile your World" so I gave it a quick look and John said he uses 1/4 x 1/4 x 1/4 to set the Ditra to the plywood. Is this acceptable too?

Lastly, In the book John says to use modified under the Ditra but the website says to use unmodified. So which one would it be? The Ditra website says unmodified should be used to set the Ditra as well as to set the tile. Am I correct?

Thanks yet again!
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Old 11-03-2011, 01:01 PM   #12
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A 1/4" x 1/4" x 1/4" square notch trowel held at a fairly close angle to the floor will be OK.

If you are installing Ditra on a plywood subfloor, use modified thinset.
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Old 11-03-2011, 03:00 PM   #13
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Just to clarify, modified between the plywood and Ditra as well as modified between the Ditra and the tile?
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Old 11-03-2011, 03:13 PM   #14
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Generally, modified between Ditra and plywood. UNmodified between Ditra and tile....
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Old 11-03-2011, 04:52 PM   #15
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What would be the preferred spacing between 12's and 6's in a pin wheel pattern? 1/8 or 3/16?
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