I'm am building a second coop for our expanding flock. I am able to get corrugated steel roofing material that is brand new from work. I am thinking of using this on the new coop but am worried about how much heat it will radiate into the coop. We live in the Sierra Nevada foothills in the California Central Valley. Our summertime temps get into the high 90's with the week or so of temps in the 100 - 110 range. The coop will be sitting in full sun from dawn until about 4 or 5 pm, then it will be shaded. The coop itself will be 8' X 8', with the front wall being 8' high and the back wall being 7' high. There will be a hardware cloth covered window in the front 5' X 3', one in the back 5' X 2', and one on each side of the coop 16" X 32". There will also be vent's along the top part of the coop on all 4 sides. The hens will have access to a shade cloth covered run outside. I am putting my older girls into this new coop, and they spend all day outside in the run unless they are laying an egg. I would like to know what luck others have had in hot climates with metal roofs. I haven't set my mind fully on this material, but figured if it's free it would be a great way to cut construction cost's. Thanks for any and all input.