I am in the early stages of planning to convert the top floor of a detached barn into guest quarters or even just a large playroom. It is typical balloon framing, about 130 years old and in excellent shape.
My question: In the top floor, I will insulate (some sort of blown-in---the stud bays aren't exactly regular). Must I put sheetrock up? Can I just cover with tongue and groove boards? Does code require sheetrock?
thanks. B.