I am going to felt over OSB board on a garage roof. At the ends, I can fold the felt down 3 or 4 inches, nail it in place and then fit a facia to tidy things up. However, I am not sure of the best way to finish off along the relatively shallow (18mm) edges and what to do at the corners. Is it ok to just fold the felt under the board and secure or would it be better to attach a strip of wood to underside of the board along each side to allow the felt to be folded down a couple of inches?
