Hi, In 2011, I built our first coop from an old tree fort. It has worked great...but unfortunately it is right in the way of the new driveway. So, I'm building Coop 2.0. I'm taking what I learned from the first coop and building something drier, better ventilated, and easier to maintain and clean. Take a look and let me know what you think so far: https://www.backyardchickens.com/a/d-family-chicks I have one question. I'm using a shed roof design with a 12 degree slope. I'm planning to use 2x4 for roof joists. I will place them 24" on center. The span from front to back wall is just 54". Will this size joist, handle this kind of span? I live in the Pacific NW and we get snow, but not usually very much. Of course the snow we do get is wet and heavy!! I'm not an engineer so I'm not sure how to determine load bearing for roofs. Any builders out there that can give me some advice?? Thanks!!