What shower tray thickness should I choose for my timber floor wet room? Do I also need tile backer boards to level up rest of the floor? Can I buy them in your store? Thanks
There are 3 thicknesses available: 20, 28 and 35 mm and they state how thick shower tray is on the edges. They are much shallower near the drain, which is a result of having premachined diagonal slopes towards the drain.
Floor boards are usually 20 mm thick and to install the shower tray you need to remove them to expose the joists, create battons, fix them to the joists and then mount at least 18 mm thick marine ply between the joists. This will create solid even support for wet room kit, which requires to be underboarded beneath entire surface.
By doing this, you will actually replace the floor board with tile backer board and this will allow to avoid total floor height increase.
Alternatively you can lay the shower tray straight on top of the floor boards but you will need to use tile backer boards to bring up rest of the floor height to the shower tray level.
You can find range of tile backer boards here.
Peter 020 7193 5485