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Unread 01-11-2020, 11:32 AM   #13
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Join Date: Jul 2005
Location: Fairfax, Va
Posts: 3,290
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Unmodified under Ditra is Schluter's guidance, unless you use one of their modified mortars. The won't recommend anyone else's modified mortars because they haven't/won't test them.

Everything I've read says to use a modified to stick anything to plywood.

And I wouldn't care at all about using a modified on top of Ditra. Mortar doesn't actually stick to the top of Ditra - it is mechanically held in by the shape of the columns. And of course using a modified under porcelain tiles is recommended.
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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