I've got reddish brown shingles on my roof, the slant faces east. So at least the south facing summer sun isn't beating down on the roof. But the attic in the coop gets pretty darn hot. I've got vents all along both the high side and the low side of the slant and I point a big fan at the ceiling...
I've used corrugated metal on runs in the past and found they make it much hotter in the run and floor than pvc, or a wooden frame, plywood and shingles. However corrugated metal cools faster once the sun is off of it where the wooden framed/shingled roof holds heat much longer. If you live in a...