Can the former sit on the joists or does it sit on the flooring
Dear Customer,
Our Showerlay must be fully underboarded, but by proper installation you can achieve the same way as if it was sitting on the floor boards. Basically you need to remove existing floor boards to expose the joists. Then you need to prepare battens and fix them to the sides of the joists. After it's done, you would need to mount at least 18 mm thick marine ply between the joists, on top of the battens. By doing this you will be able to replace former floor boards with the shower tray.
Please see our fitting instructions for more details.
I am happy to help if you have any questions.
Kind regards
Agnes D, 020 7193 0953