I have a 12x32 barn style shed that I’m fixing as best I can into a shop. I be got the fiberglass insulation for the walls and 5/8 Sheetrock for the walls but I’m at a loss for what to do about the roof area. It is a metal roof that is attached directly to the rafters and I’m worried about condensation forming between the metal and the insulation. I’ve been thinking about using form board attached directly to the metal with some type of adhesive. I looked into the spray foam but it’s a little more pricey than I’m comfortable with for a shop/man cave