We're in the process of building our first coop. (no chickens yet... gotta get this coop done!) Over the years, we've saved and accumulated lots of various materials and so this is mostly being build from salvaged/re-purposed materials. We have some metal barn roofing/siding that was saved when ice took down our horse barn several years ago and had to be rebuilt, so we were going to use this as our roofing. Do I need to first use plywood over my rafters then attach the metal roofing to that, or can we JUST use the metal straight to the rafters? (like is done in our horse barns and lean-to) We live in SE Kansas, if that matters. A few months of colder weather... some severe, but USUALLY our 'normal ranges' for winter temps are in the 20's and 30's. Our summer temps can get quite humid and hot-- going on several weeks of 90+ temps with heat indexes up to 120. (great time to build outside, right?) We're planning a lot of ventilation (hardware cloth) up high under the eaves- so the walls won't be solid up to the roof anyway. (there will also be 4 large windows (hardware cloth) on 3 sides that can be covered all the way or partially in the winter, but be left open the rest of the time. The building is a 6X9 and will have a 12X40 run...and house 8-10 birds. Not sure any of this matters as far as the roofing goes, but it might, so I included it! It's not a problem to line the roof with plywood first, that's is our initial plan, but I just got to wondering if that's a 'waste' of time and materials if it's not really needed? (of course, my husband has commented that metal alone would be 'too loud' for the birds during heavy rain or hail... however, he didn't seem to mind that for all my horses OR me when the barn was rebulit! ) It can get deafening in that barn...especially during heavy rain or hail... but the horses and I have survived it every time with no ill effects... Thanks!