Do your birds ever get off the concrete onto dirt or grass? Or is thE coop enclosure where they stay?
Our birds are backyard free-range so they use the coop only for egg-laying and roosting. Not everything is concrete and paver stones - those areas are for our benefit to walk and we are still working on finishing the pavers. The chickens have a backyard of dirt just for them. Under the canopy is a square dust bath for them. In winter they get access to the raised garden beds (2 of them). We use a 28-inch tall rabbit fence roll to keep the chickens divided from our people space. We were going to make a permanent fence separation but find the rabbit fence roll versatile to move around as needed and the chickens have learned to respect fence barriers.