The steel roof provides even more structure to keep the rafters from swaying. I chose a 30 year Everlast II roof (they guarantee is won't rust for at least thirty years) that comes in three foot sections and is custom cut to length. I got what I thought was a great deal through my local Hardwick Farmer's Exchange www.hardwickfarmers.com . You need about three people for that job and it wasn't that difficult at all. I hired some handymen but it turned out that I could have done the work myself as long as I had two more friends that weren't afraid of heights.