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Unread 03-14-2015, 04:18 PM   #1
John A
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Ditra over plywood and Henry's

What a great forum.

We have a master bath that we are updating. We removed the fiberglass shower stall, the tile around the soak tub deck and the old white 4" ceramic tile over wonderboard on the floor. This tile was installed 19 years ago when we built the house and there has never been a crack or any loose grout.
I ran our spec through the deflecto and came up with L444 so we are good for the 18 x 18 porcelain tile my wife wants on the floor.
The subfloor is 3/4" plywood and the underlayment is 1/2" plywood.
Running down the center of the floor is a dip of between 1/4 and 5/16" about 2 feet wide. I'm guessing that the framers put a joist in crown down. I filled in the dip with Henry's 547.
I plan on using Ditra but have a question about the thinset over the Henry's. Since it is a cement product, do I have to use unmodified thinset under the Ditra and modified over the plywood or can I just use one or the other?
Sometimes there is too much information to process.

Thanks,
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Unread 03-14-2015, 04:25 PM   #2
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Welcome, John.

Yep, I think you're suffering from TMI. Just use a polymer modified thinset mortar that says on the bag it meets ANSI A118.11 when mixed with water.

My opinion; worth price charged.
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Unread 03-14-2015, 04:50 PM   #3
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Thank you for quick reply. I have a couple bags of Versabond that meet that spec.
More questions to come.
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Unread 03-18-2015, 04:20 PM   #4
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Well......
My floor turned out to be a lot waiver than I first thought. In addition to the dip in the center, there are 1/4" dips by the soak tub wall and by the vanity. If I would have seen this before, I would have used a self leveling compound on the whole floor..
I have already filled the dip in the center with Henry's 547. I am going to fill in the other dips the same way. I will end up with about 75% of my floor covered in Henry's and the rest is plywood.
Since the majority of the floor is cement do I still use a polymer fortified thinset?
This is really confusing to me.

John
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Unread 03-18-2015, 04:44 PM   #5
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I would heed CX's original advice. Mostly because HE said it and partly because you already have the thinset...use it.

Wouldn't it be silly use modified on the wood and unmodified on the Henry's?
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Unread 03-18-2015, 04:56 PM   #6
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No confusion here, John. If you need to bond to plywood anywhere you must use a modified thinset mortar meeting the requirements of ANSI A118.11. That's not negotiable.

Use it for your entire Ditra installation.

My opinion; worth price charged.
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Unread 03-18-2015, 04:57 PM   #7
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Chris,
I am concerned about the Ditra over the cement. The Schluter guide says to use unmodified thinset over concrete. Is Henry's considered concrete? What is the difference between cement and concrete?

John
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Unread 03-18-2015, 05:00 PM   #8
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No confusion here, John. If you need to bond to plywood anywhere you must use a modified thinset mortar meeting the requirements of ANSI A118.11. That's not negotiable.

Use it for your entire Ditra installation.

My opinion; worth price charged.


Got it.
Thank you very much.
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Unread 03-18-2015, 05:02 PM   #9
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John, if you'll visit our FAQ you'll find a brief tutorial on how to post and properly attribute quotes here on the forum. Very simple once you see it.
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Unread 03-18-2015, 05:27 PM   #10
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Since your layer is going to be quite thin, and you have the wood underneath it and the cross-hatch of air channels in the Ditra itself on the bottom, I don't see an issue using it when installing the Ditra - it will be able to dry out through what's there. You need to use an appropriate mortar on top of the Ditra, and that should not be a modified. A typical concrete slab would be much thicker and denser, and would be more of a variable for how long it might take to dry the modifiers.
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Unread 08-13-2015, 07:40 PM   #11
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Done.

Our bathroom remodels are done and they turned our great. Thanks to all the info on this forum, we have 2 finished bathrooms. I have attached pictures of our master bath. The other upstairs bath turned out just as good
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Unread 08-13-2015, 07:43 PM   #12
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Done

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Unread 08-13-2015, 07:44 PM   #13
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Unread 08-14-2015, 12:56 PM   #14
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Nicely done!
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Unread 08-14-2015, 07:37 PM   #15
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I second that. It looks good!
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