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  • That looks intimidating :) Ours put a plywood floor (which was then tanked) over the joists, onto which went the wet room tray, onto which went the tiles if that's any use. The drain position in the plywood was transferred from the tray

  • Yeah that is helpful, I’m building a picture in my head of the layers to build it up. The ceiling is quite high (>2.4m), so I think if we go for panels, rather than fannying around with extra pieces above the main boards, raising the base to suit will be better (and improve fall).

    Ceiling height - panel height (inc sealant gaps) - tray height - tray fixing (?) = height of shower platform

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