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No chance that they are now putting in a mat over the tanking to stop the tiles cracking? I guess I would expect fully tanked not to require a shower tray in any case but a modern tiled bathroom could easily have a tanking sheet under the whole thing with a tiling mat on top wherever it's having tiles.
I have never tanked a bathroom though so couldn't say for sure. It does seem logical that tanking would cover the whole floor and come up the walls a little bit though.
Mother in law is having her bathroom done. They're meant to be tanking the floor and walls. For the floor I was surprised to see they'd put the shower tray and bath in and were going to tank the floor afterwards, I'd assumed you'd do it first.
How would people expect it to be done?