When I bought the trays I phoned coram customer support and was advised that part of the wall should be chased out to allow the tray to fit in my alcove. The alcove consisted of a dry lined wall and two stud partitions with plastered plaster board, the problem seems to be that the tray flexes and cracks the grout above the first row of 4" by 8" tiles which overlap the tray. The water gets inside this crack and runs down behind the tray through the floor and through the ceiling below. I can only reach the front three legs but it would appear that they might loosen (unscrew) with repeated use of the shower.
The tray fits in the alcove between the wood of the studwork but doesn't have plasterboard against each side.
What do you suggest?
I am considering using mastic instead of grout above the first row of tiles, trying to fix the legs so they can't spin with mastic/a screw (??) or using a row of larger tiles above the tray such as the 12 inch floor tiles I have in the bathroom.