I am getting quotes for a shower with a 1400 x 900 tray needed. Most have recommended stone resin but one plumber said that a stone resin tray set on timber would be a risk should the timber warp then i would get movement and water ingress. He suggested a resin tray with adjustable legs that can be accessed by a removable plinth- should there be any movement just adjust the legs.
Any thoughts you clever people out there?
Martin