I still have no chickens. I finished reading "Chickens for Dummies". Learned a lot. The coop on our property is pretty good but I need to move it. I also need to build a run. There is a large concrete pad I can use and put the coop against one side with outside acess for eggs collection and I can enclose it with a nice fence and roof. Is this a stupid idea to put it on concrete? I can put some dirt or sawdust or something on the floor for comfort etc but I though it would help keep digging critters out and easy to clean. Any advice?