I'm putting in a prefab steam shower in my bathroom, replacing a standard bathtub/shower. My question is do I need to put greenboard on the walls surrounding the steam shower--two outside and one inside wall. Currently the three walls have regular sheetrock with insulation on the two outside walls, and the steam shower will sit about 2 inches from the walls. The steam shower will be sealed so any moisture will be contained. It does not have an independent exhaust to the outside, so am installing a much larger bathroom exhaust fan, for when the door is opened after use. A toilet is also in the bathroom, with a door leading to the sink and vanity in another space. On first look, my gut says the sheetrock should be OK as I don't expect much moisture to be retained in the bathroom, but I'm not sure. Any help would be appreciated.
I think all you need is drywall and a very good primer as you should do anyway. I
like Zinser and Kilz gold.... They are oil based but you can paint over
them with latex in 60 minutes.
I would go all the way to cement board, myself. You probably don't want to ever have to mess with this again, and cement board will stand up the best to a moist environment.
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