i m buiklding a workshop about 4 sq with metal roof am going to spend alot of timee in there should i put the metal right on the rafters r i should probably put plywood down first dont know anything about metal but figure its mine so i doesnt matter if i mess it up. also in the northeast
Its only 4 squares, so put the plywood down and also insulate the heck out of it too.
Depends on the type of metal. The metal you are going to use, I would probably use perlins.