I'm renovating my son's house o joy, I need some advice on what type of floor to put down on the bathroom joists, OSB, Marine ply, or wooden floor boards. what ever it is I will also be putting down 6mm concrete board on to it for tiling, also we will be putting in a large walk in shower tray 1400x900, so need a good base for this. Thankyou for any advice you can give. Jason
