Renovating an old bathroom. When I removed the walls, I took out a coarse paper in the wall facing the catwalk, and now there's only a plank wall left. Two other walls are vertical planks with some thin paper that smells of tar, and then battens and tongue and groove boards on the inside. The last wall I'm framing myself in front of a chimney that isn't used.
I plan to put OSB and drywall on all the walls but wonder if I also need some kind of paper or plastic in any of the walls? There's barely any plastic elsewhere in the house today, and it seems questionable behind the waterproofing. I plan to put up fabric and paint the walls, by the way.
The same question applies to the ceiling where I will lower with battens and add drywall painted with a vapor-tight system. Should there be some kind of paper there? The ceiling today is tongue and groove boards with some paper behind and then a cold attic or roof.
