When I was building my coop and run I was concerned about the potential snow load on the mesh over my run. I have seen runs with the mesh pushed all the way to the ground. With a one inch mesh you might think that the snow would fall through it. It doesn't, it very quickly sticks together on the mesh forming a roof. My run is 16'x16' and I put in 12 rafters to a center pole. If you live in a snow area you might want to consider this.
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