my coop/run area is set up with a 2x4 welded wire across the floor and up the sides about 24" (to keep critters from digging under and in) then laid over with screen, covered with pea gravel, and plenty of fresh lawn clippings on top of that. The flock gets to get out and free roam the yard, but hopefully ive done a decent job at making the locked in run area nice enough. Im hoping for the combination of clippings and droppings to break down into a nice soil type compost layer for the run floor. Good tip on putting DE in there as well, i think i will add that to the mix with the next dump of grass.