I found this neat coop to use as a brooder on Pinterest and I really like it, but I am wondering how to keep the inside dry without a ridge flashing on top?
Install a gutter inside just below the ridge peak and have it drain outside on ether gable end. Whatever makes it thru the ridge gap will be caught and directed outside of coop.
There is also another way, and that is to make one roof panel side overhang the other by significant amount. That will also keep rain out.