We are expanding our number of chickens this year so we built a much larger coop. About 8 x 12. We are doing in a frame roof using of course plywood but we were looking for an affordable roofing material to cover it with. We Used sheet metal on all the coops and shelters we’ve built but we ran out of the extra we had and were thinking about using something different. The sheet metal we had before was free from our neighbor so that’s why were used it but I believe going the route of shingles is too expensive. Any suggestions?