After I built the first run, we had a rainy summer, and the run was a muddy mess. Flies soon followed, and I learned a hard lesson about the Florida summer climate. After that, the first run, as well as subsequent runs and coops, had a metal roof installed. I use Gibralter Corrugated Steel panels at a 1:3 pitch. Every roof has a gutter system, and they empty into rain barrels. After our Monsoon season, the winter and spring seasons tend to be extremely dry, and the extra water cuts down on the utility bills. The cost of steel panels pays off after 2 years, and is actually cheaper than a continuous parade of blue tarps. The coops, runs, and roofs survived Hurricane Irma without a problem. The sides and interior roof are enclosed with hardware cloth, to keep the flocks safe from predators, both 4 and 2 legged.