Hi to all, I have a new extension in my house included a new acrylic shower tray. The plumber put in the tray with the tiling being lft down to me. I have installed granite tiles to the floor area around the shower tray and the corner wall section behind it. But, subsequently I have found the tray creaks like mad when stood upon. The tray won't come out now due to the tiling, and that it was in place prior to plastering. Any ideas? I have discussed drilling an access hole into the side of it and piping expanding foam into the void to aid support (the tray does not creak on the shoulder sections, just within the standing areas) with the plumber and he thought it was probably the only way to cure the problem without removing it (and the tiles - very difficult) Any ideas gratefully received.