Our en-suite and main bathroom will both be wet rooms.
I have identified the wet room formers for the 2 shower areas, they are 22mm thick, but for reasons of budget (lack of) I am not buying them yet. I do however want to floor most of the rooms.
So what 22mm thick floor boarding for a wet room, suspended on Posijoists at 600mm centres?
Is it as simple as P5 chipboard, or something more exotic?