Vapor barrier or no vapor barrier?
I cannot seem to find a definitive answer to my question. I own a family campground in western NY which is open from May 1st through mid October. The main building is an A Frame with wings on both sides of the “A”. There is no insulation and the inside of one of the wings is unfinished, the ceiling is roof sheathing and rafters. The building is closed during the cold winter months while I sun myself in Florida so heating is not needed. I do want to add air conditioning to make the space more usable during the hot, humid summer months. I am so confused about the info I read on how to insulate. Vapor barrier or no vapor barrier, ventilation or no ventilation? The building is used occasionally on weekends and will not be cooled constantly but only when needed. Since the roof line ends at the A frame portion of the building, there is no ridge and no way that I know of to add ventilation other than at the soffit.
Any help will be appreciated.