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Old 02-02-2018, 09:07 AM   #1
renue74
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unmodified mortar between plywood subfloor and Ditra

I accidentally used Latricrete 317 unmodified thinset to put Ditra on a plywood subfloor.

Will it be OK?

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Old 02-02-2018, 09:26 AM   #2
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Probably not, unfortunately.

How big of an area are we talking?
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Old 02-02-2018, 10:10 AM   #3
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Yeah, I agree with Greg. I wouldn't depend on it.
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Old 02-02-2018, 11:21 AM   #4
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Many people have had good luck pulling up ditra that has only been installed for less than 48 hours.
Pull it up, clean the ditra with a high power nozzle on your garden hose. Or use new ditra.

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Old 02-02-2018, 03:11 PM   #5
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I pulled up the Ditra today during my lunch break. The mortar was still fairly damp.

I scraped a lot of it off the subfloor and I will go back tonight and spray the back of the ditra sheets.

Schluter said it would be OK to reuse the Ditra.

I'll reinstall it tomorrow with modified thinset mortar.
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Old 02-02-2018, 05:48 PM   #6
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As long as the fleece on the back is intact, you'll be able to get a bond.

It would have been much better to hose the Ditra off instead of waiting!
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Old 02-04-2018, 10:08 PM   #7
renue74
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Friday night I went back over and installed the ditra with a latricrete 253 mortar.

It was basically a small bathroom and laundry/mud room area...but still took me about an 1 hour to clean up the old mortar and get as much as a can off the Ditra.

I went back and laid tile Saturday. Before I started, I checked the ditra and it had adhered to the floor...so I'm hoping it's good.
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Old 02-04-2018, 10:14 PM   #8
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That looks really nice.
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Old 02-04-2018, 10:37 PM   #9
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Not sure if you're aware ditra has a minimum tile size of 2" x 2". Schluter's concern is tiles smaller than that might mainly be sitting on the hollow ditra ribs, and a point load may cause it to compress.
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Old 02-05-2018, 01:43 AM   #10
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You really should have used cement board as your underlayment. Will you have trouble because of those 1" pieces? I can't say for sure. I do know, however, that you probably aren't that keen about starting over again.
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Old 02-05-2018, 11:54 AM   #11
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Umm..yeah. I'm not starting over.

I'm going to grout next weekend.

It's a college rental house. If it starts causing issues, I'll fix it then.
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Old 02-05-2018, 06:01 PM   #12
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I'd consider using an epoxy grout. It's bond to the tile edge is stronger, and might help prevent a failure, but certainly won't guarantee it. It will make the tile appear to be larger, spreading any point load out. Bare feet, or normal shoes probably wouldn't be an issue, but someone in high heels will put an enormous point load on the tile...if it's not large enough to span enough thinset pillars, it could tip and/or crack.
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Old 02-05-2018, 06:20 PM   #13
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Thanks! I'll definitely try the epoxy grout.
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