From what I’ve read, Ditra is the best product to use on top of a plywood subfloor to install a ceramic tile finish floor. I recommended it to my customer who is well educated and built most of his own home. Out here in the country, I will be helping him install his floor.
In the city, he “asked around” various tile contractors who said they don’t like it and don’t use it anymore due to cracks in the grout and that it is too flexible.
Please chime in on these comments. Thanks.