I've seen different versions of roosts and poop-boards or boxes that seemed really efficient. Our coop is only 4' x 8' so space was at a premium and some of the designs I've seen wouldn't work for us. The roost in our coop was already in place and the birds use it nightly. So... we mounted a shelf just under the roost, and placed under-the-bed storage containers on the shelf. The containers have a layer of pine shavings and a dusting of DE in them. Every few days I add another layer of shavings and another dusting of DE. Once a week or thereabouts I dump the containers and start fresh. No flies, and the boxes really cut down on the poop in the coop . Sooo, many thanks to those of you who have posted pics of your roosts and poop boards/boxes. I wouldn't have thought of this myself. Here's a pic of the roost and poop boxes, mounted over their newly installed nexting boxes.