My flock free-ranges on 2 acres fenced in web wire, daily. I have seen many suggestions about coop space on the boards like 4 sf per bird etc. If they free range is this still necessary. I have had chickens for about a year and a half now and I am thinking about getting a few more and was concerned about space. My coop is 16 X 8 and they only use it to lay and roost, I have 15 nest boxes so that is not going to be a problem and I have about 90 ft of roost space, and could add a little more but it is definately not necessary now. My question is how many full size birds can I safely house in this situation.