Just like tiling the kitchen and dining room, under the carpet I found vinyl on particle-board subfloor. All of it had to come out....
and be replaced with plywood.
Once the new plywood was in, the Ditra was laid on top (shown here prior to mortaring onto the subfloor).
I spent several hours cutting all the tile first which is a bit risky as it is hard to keep the tiles from shifting and the cuts consistent. Once all the tiles were cut, they got mortared in and let set for a day or two.
Grouted.
The new toilet gets installed and everything gets caulked and prettied up.