I am a brand new back-yard-chickenster. I am re-cycling an existing wooden box into a coop. The box is 40" x 40" x 25" According to my plan this means the coop will be about 2 feet tall inside. My question is how high I should mount the roost. I want to put it as high as possible to discourage roosting in the nests, but I do not know how much room above the roost bar in needed. I suppose I am asking how tall a roosting chicken is or whether they discourage by proximity to the ceiling. Thank you, AndHam P.S. This coop is going to be part of a chicken tractor so it will have a run which extends under it. The coop will be high enough for easy person access. My question is only about the comfort of the chickens inside the enclosed coop portion.