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I am re-doing the bathroom which is a combination of tub-shower. I removed the old tub and with it, unfortunately, all room drywall. The bathroom is located below the vented attic insulated with paper faced fiberglass and blown cellulose. The bathroom fan wasn't ventilating through the roof, where the opening is but in the attic, so half of the ceiling was sagging. We removed the half ceiling, we sliced the paper on the insulation from the exterior wall and placed on it the poly vapor barrier. We bought the greenboard for the half ceiling and the rest of the bathroom, but I have read that greenboard should't be placed over vapor barrier. On the walls around the tub we placed the cementnt board. My question is for the exterior wall and ceiling poly vapor barrier and greenboard is OK, or should we go with regular drywall or take down the vapor barrier and place only the greenboard (it is an exterior wall)?. Thanks