The boards are 24" wide with the roosts centered over them. The surface of the roost is 13" from the surface of the board. I find this height to work well to keep roosted birds from giving head shots to birds walking along the board trying to find a spot as well as giving me enough room to scrape under the roosts.I saw your post on another thread. How far do you have your roosts from your poop trays and how big are your poop trays??