This is my coop and run. I'm talking about the exterior run which doesn't have a roof. I'm starting to realize the obvious flaws of having a run without a roof, as I lose the space for chickens to go during rainy and snowy days. So I'm thinking about adding a corrugated plastic roof. Now the issue is that when I designed this, there was no intent for a roof, so I have concern over the load it can bear. The run measures 8x4x6. The 4 posts on the outside are 2x4s. The 2x4s that run across the middle are flush with the posts, and the 2x6's on the bottom and 2x4's on top run on the outside of the post. That triangle in the middle offers no support, it was only put there for style. As I mentioned I'm considering working with either corrugated plastic or metal. I plan to make the roof flat and on about a 30 degree angle. To do this I plan to run 3 2x4's off the top 2x4 in the back (high enough to make a 30 degree angle), and then run a 2x4 off the top of those parallel to the current one. I would then run 2x4 rafters across, and then attach the corrugated plastic to that. I know this run can hold the weight of the plastic/metal, but what I'm concerned about is potential snow accumulation on top and wind resistance. But do you think it can handle that? If not are here any improvements you recommend structural wise? And also does anyone have advice on my plan or working with corrugated plastic/metal?