I just wanted to clarify my thinking, I'm not saying that DITRA not good.
it is only a surplus for this type of work, in all my works, I have never seen cracks in the tiles or customers who call me for problems.
many times I have taken responsibility that not even the customer and the 'plumber, they wanted to take, but the floors after years are still there.
also say that lately, new types of screeds allow you to perform tiles even without expansion joints on UHF. (See my recent works performed).
the landlord, building engineer, told me that this type of screed, tiles allows up to 100 square meters without expansion joints.
other constructor, are at least three years that no longer wants expansion joints on the doors, for now he is right, later with time we will see if he exaggerated.
For me yes.