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Old 03-04-2018, 12:47 PM   #1
Mr Hunter
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I messed up - Ditra Confusion

Hello,

I think I messed up and used modified thinset over ditra to set porcelain tiles.

How bad is this? Does it just need extra drying time?

Thanks!
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Old 03-04-2018, 01:04 PM   #2
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lots of time to dry
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Old 03-04-2018, 01:54 PM   #3
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I do it all the time to make sure the thinset bonds well to the porcelain tiles. Like Robert says, allow an extra few days to dry and keep the heat on in the room.
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Old 03-04-2018, 02:06 PM   #4
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Lots of time to dry and damn to hell with the warranty!
You will be fine.
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Old 03-04-2018, 03:18 PM   #5
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Not all modified thinsets are alike. Some modifiers will work well, some won't. Some will become stable while still wet, some won't (generally, those that use latex as the modifier won't be stable until they dry). Porcelain won't really allow moisture through it anytime fast, neither will Ditra, so the only place it can evaporate from is the edge, and with some modifiers, they make it really hard for moisture to migrate to the grout joints. In the worst case, with a large format tile, it could literally take over two months for full drying. Things should be fairly stable prior to that. The cement will cure, but if the modifiers aren't stable, the crystals of cured cement can shatter at a microscopic level.

So, depends on what exactly you used and how much you stress the floor, how dry the air is so moisture will evaporate faster (a fan and heat can help).
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Old 03-05-2018, 06:36 PM   #6
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Thanks for your help. This makes me feel way better.

Now, if installing tile over painted drywall on a wall in a dry area, modified thinset?
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Old 03-05-2018, 06:44 PM   #7
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Yup.
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Old 03-05-2018, 10:06 PM   #8
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Thinset will stick to most paint used in a home, but there's no guarantee that that might not cause the paint to come loose from the wall. If it's a gloss, scuff it up and clean off the dust.
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