1) Which is better for a vapor barrier in a bathroom? Regular drywall with a 4 mil plastic vapor barrier or greenboard? My understanding is that you shouldn't use both greenboard and a vapor barrier.
2) Only exterior walls and ceilings below attic spaces need the vapor barrier right?
3) How about behind shower tile. Does 4 mil plastic and cement board work?
2) Only exterior walls and ceilings below attic spaces need the vapor barrier right?
3) How about behind shower tile. Does 4 mil plastic and cement board work?