Ditra mistake


Old 11-25-12, 06:47 PM
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Ditra mistake

I am tiling a small bathroom. I laid 5/8 plywood and then Ditra but I inadvertently used unmodifed thinset to install the Ditra. Once I realized the error (days later), I pulled up the Ditra (which came up easily with not much thinset adhered to the back). Now I have a thin layer of unmodified thinset over the plywood. I scraped it smooth. Now I am wondering how to proceed. The Ditra instructions say to use modified thinset over plywood, but now there is a nice layer of fairly smooth mortar over the plywood. So do I use modified thinset over the unmodified? or another layer of unmodified (as if I am tiling over concrete). Removing all the unmodified will be very difficult. Thanks
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Old 11-26-12, 10:00 AM
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Join Date: Jul 2007
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You might try Levelquik latex primer. It is a primer that is applies to concrete prior to using self-leveling compound to promote a better bond. A thin layer of SLC might not be a bad idea to smooth out the surface prior to proceeding. Although SCL directly on plywood calls for wire lathe in addition to the primer. Available a big box stores.

LevelQuik® Latex Primer | Custom Building Products
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