We are just about done with our run build, except for needing to redo the roof. The main issue is that it keeps sagging under any amount of snow or rain. The tension we can create on the edges is not enough to keep it taught enough for it to not sag under even a small snow load (we got 3 inches a few days ago). I have a lot of ideas for long term solutions, but my short term solution is to take the tarp off and replace it with the much shorter tarp that came with this kit, which only covers 1/3rd of this run. Will that offer adequate rain shelter? Will the chickens know to go back into the coop in bad weather? Or do I absolutely need to cover my entire run? To the right of this run their are several mature trees that offer significant shade throughout the day, so I am not so worried about sun, just rain.