I am currently building a shower room with a studwork wall.
I intended facing the wall on the shower side with 12mm exterior ply (instead of plasterboard) and then tiling with a waterproof adhesive and grout. The bloke in Jewsons, however, suggests I use marine ply at £50 per sheet (8x4).
Is this really necessary or should I even just go with plasterboard. I think Wickes do a waterproof version.
Anybody got any suggestions.
Many t's