I am SO GLAD I spent many hours perusing this site before building my coop this year; otherwise I would be in exactly the same predicament. Fortunately, however, I have a 45 degree steep pitch truss metal roof covering the run because we get a lot of snow here. I kind of felt as though were making the coop too overbuilt, but not anymore! Let it snow, let it snow, let it snow!
p.s. I got the metal roofing for free - it came off a neighbour's shop roof when he replaced it. (And I've seen decent used metal roofing going for scrap many times; I would recommend freecycle.org to anyone looking for some.)
p.s. I got the metal roofing for free - it came off a neighbour's shop roof when he replaced it. (And I've seen decent used metal roofing going for scrap many times; I would recommend freecycle.org to anyone looking for some.)