Mapeii does not reccomend on Ditra !

[Concrete guy]

Ditra is a totally different product from what it was 20 years ago Alan when it had hessian backing and had channels instead of dovetailed dimples, part of the problem back then was it was mis-sold as a magic carpet solution for floors with unsuitable substrates i saw many failures at that time too but now I am a believer and think it is a good product when used correctly, it is overly specified at times and some builders still believe it to be the magic carpet solution to badly prepared substrates

That makes a lot of sense it was just an awful product way back then.