I am thinking of making a raised end to the bathroom about 1650 long (the end of the bathroom where the bath is currently) by 700mm wide - to accomodate a walk in shower tray of 1000 x 700 to raise it to a height where the waste can be above the top of the joist (as it is now from the bath).
I envisage this being a better solution than putting the shower tray on risers and will make entering a bit easier.
The current floor is tongue and groove.I am thinking the way would be to screw down some wooden spacers and overlay it with a waterproof board (what) and then fit tray and tile the exposed part.
Any thoughts?