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Unread 09-26-2007, 09:14 AM   #1
Paul B.
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Ditra and Epoxy glue

I have already used standard thinset mortar with a 1/8 inch V trowel to bond DITRA to a concrete slab.
But there is now a section in the middle (maybe a 24" square area?) that is loose.
I noticed the DITRA buckling up slightly a few says later in one spot ( still haven't tiled over it) , and I can see that the bond came undone. I will be tiling with 12 inch squares of Travertine. I think I put the mortar on too dry, but I did press down hard on the Ditra when I was laying it down.

Can I cut this area of DITRA out with a utility knife, or dremel tool, and glue it back down with two-party epoxy glue? If I add more fresh mortar on top of the old dried mortar, I'm afraid that the ditra areas will now become raised. Would I really have to scrape out the old dry mortar, and put fresh mortar down in its place?

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Unread 09-26-2007, 09:26 AM   #2
Mike2
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Paul, cut the loose Ditra out and then see what you've got. Might be surprised how easily that mortar with the bond failure will scrape up.

In any case I wouldn't use epoxy to set Ditra.
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Unread 09-26-2007, 10:04 AM   #3
kevjob
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try stepping up in notches and make the thinset a little runny.
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Unread 09-26-2007, 10:30 AM   #4
Paul B.
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Kevin- what do you mean by 'stepping up in notches'?
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Unread 09-26-2007, 01:37 PM   #5
Mike2
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An example of "stepping up" would be; If you originally used a 1/4" x 3/16" v-notch trowel, move up (step up) to the next larger size, a 1/4" x 1/4" v-notch.
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Unread 09-26-2007, 05:01 PM   #6
jadnashua
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Depending on how long it has been, the old thinset may scrape up fairly easily...go that route first and see what happens. A utility knife will cut the Ditra fairly easily. When you get it up, check the fleece to see if it has any thinset on it. You may have waited too long to get the Ditra layed over the thinset, or it could have been too dry to start with.
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