big problem, need advice please

[tommyzooom]

Have done a few repair jobs similar to yours,
If possible I like to leave a gap of about 5mm around the tray, tank down past the top of the tray(use a float or, even better tank before tray is fitted)and then fill the gap with lots of Silicon,the tile will cover this,and then a neat bead of Silicon after it's tiled
Much better to stand movement to tray than a thin bead of Silicon or tape
Your client should be able to make a claim on his house insurance to cover the repair by the way

 

[Dan]

I too would want to really get to the bottom of the route of the problem. I'd recommend ripping it out too, though perhaps you could do it bit by bit in the hope you find the problem before ripping it all out.

Sounds like it really needs tanking properly this time, though if the 'damp' is in area's where the shower/bath isn't, then it might be a problem much greater than just the tiling as suggested above a couple of times.

 

[doug boardley]

I'd go for a full rip out too, also do a test on the waste trap, pipework etc whilst everything is exposed, I can't see 3 tilers getting the same ingress problem, (unless, of course, the shower tray is moving somehow)