Beadboard shower walls?
I'm thinking about using beadboard sheets as a shower wall material. Would I absolutely need to get exterior pvc beadboard, or could I use regular beadboard over cement board and redguard? I would coat the beadboard with underwater-rated marine paint and urethane, and caulk the seams (which should be minimal since it's sheeting rather than tongue and groove).
Any experience doing this sort of thing? What would it take to make it work?