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This is my concern as well. I have not seen any information about anyone installing a shower tray on underlay. However, this is what the manufacturer recommends (challenged them 3x on this topic). If I install on a rigid base and it fails again, I have nowhere to go (albeit the GRP tray is...

As part of my build, I fitted an acrylic shower tray. I built a frame to support the edges of the tray, then installed 50mm of PIR to support the drain pipes (internal). For the tray, I bonded 9mm marine ply to the underside of the tray to give support, then used 3mm underlay between the PIR and...