I am still in the process of trying to figure out how I can convert my pigeon loft into a chicken coop and part of that is deciding how to build my roost. In the interest of conserving floor space, I had thought of building a ladder roost, with the top rail being 18" from the roof and then every 18" down the ladder. Considering the fact that my hens are Black Australorp, Buff Orpington, and Barred Rock, what would be the steepest angle I could use and still allow them to access the roost? What I am trying to do is to keep the foot of the roost as close to the wall as I can and still have a roost they can use, thus freeing up floor space. The dimensions of the coop are 9' long x 6' deep x about 6.5' tall at the back wall.