I need to know if my two roost boards being the same height will work.I biult a poop board set up for pdz and screened it over with chicken wire that is up enough I can scoop. Then I put two roost bars about eight inches over the poop board that run the 10'. I am going to put a couple of Cross boards as the ladder board is on the east end. Do I need these boards to be different heights? 1'apart