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Finally got a coop design i'm happy with. The base is 92.5" long, the cross members are 44.5". The goal is to have the base covered by a 4x8 sheet of welded wire, 1/2" by 1" holes. I use the small wire so that there's plenty of support for chicken feet.
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Once the bases are assembled, you nail the legs on each corner. The front lengs are 76" pressure treated 2x6, the back legs are 66" long 2x4. I use pressure treated lumber for the legs because they're ground contact, and my ground is pretty darn wet. Plus I'll want these coops to last 5 or 10 years without maintenance. The front legs are 2x6 to allow mounting space for the doors. The 2x6 are nailed sticking halfway out.
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Once the legs go on, you attach the side supports on each end -- a 4' piece of 2x4 with the end cut at a 15 degree angle, and three roof rafters, which happen to be 8' lengths of 2x4.
From here it's a matter of attaching plywood. That's the 3x8 plywood I listed in the parts list; I chose the 3/8" plywood mostly for cost. It's there for diagonal support and as a wind break, so it doesn't have to be very thick. The doors I make out of 1/2 plywood so that they're a little stiffer and will hold up better.
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