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Unread 04-13-2021, 07:57 AM   #1
Jacko96
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Ditra over OSB w/ Unmodified

I, like many others, used UNmodified thinset to install my Ditra over OSB.
I finished my shower floor, still having energy and thinset, I moved right to the bathroom floor.
However, unlike others, I finished laying my tile before realizing what I did wrong.

I used Mapei Uncoupling Membrane Mortar & 11" Hexagon Porcelain Tiles.
Its also only 37 Sq Ft of Ditra/Tile.

I'm really hoping I will be fine leaving it as is.
Lets hear it....

Thanks in advance.
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Unread 04-13-2021, 07:59 AM   #2
Lou_MA
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I’d pull up the ditra. Unmodified doesn’t bond to osb.

At least the square footage isn’t that big. And better now than after toilet, sink, base trim etc are all installed.
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Unread 04-13-2021, 11:37 AM   #3
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Welcome, Jack.

With that mortar I'd hafta agree with what Lou said.

My opinion; worth price charged.
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Unread 04-13-2021, 11:42 AM   #4
jadnashua
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What you might end up with eventually is effectively a floating floor held together by the thinset on top and the grout...if you start to hear crunching when walking on it, the grout joints will fail soon, and you'll have to deal with it. The likelihood is high that it will fail. Best to deal with it on your own timeline if you can.
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Unread 04-13-2021, 12:23 PM   #5
Jacko96
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Well I guess I'm not surprised as to what I should do.
I'm still considering leaving it as is and seeing how it holds up since it's my house and not a clients/friends house.

I plan to build a floating vanity, so if it the floor fails horribly, all I'll have to remove is toilet and baseboards to replace it.

So in this instance, would you guys suggest me using an epoxy grout or standard grout?
I was assuming epoxy grout for its strength but then I read that that would only "relocate" the stress to the tile and possibly crack a tile instead of the grout.
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