Our pool house has 4 rooms, an equipment room, bathroom, and two changing rooms. No HVAC other than a vent for the propane heater. Currently the rooms are "finished" with a Masonite board on the walls and an outdoor-type carpet; they look and feel gross; I'd like to replace the floor with tile, but am not sure what to use for the walls. What will hold up against the moisture, especially without HVAC (the doors have angled slats, but that's about it for air flow)?
My ideal look would be a board & batten style maybe 2/3 of the way up the wall and then flat (e.g., drywall) for the top 1/3 & ceiling. Will primed wood and green-board drywall hold up okay?
Here's a couple pictures I took when we first moved in: