What thickness of sheet metal is good for coop roofs? I have a coop with the cheap plywood/particle board as the roof but it it sucks. I don't really want to shingle over it. I thought sheet of metal would be easier. Also what other things do I need to install the sheet metal? Should I use roofing nails? Screws? We get some wind where I'm at so I don't want it to blow away...lol. Thanks!