I'm new to raising chickens, and only recently got my first three. My first coop/run is relatively small, roughly 9.5ft x 2.5ft (23.75sq ft?), not counting the roost and nesting boxes. Right now I've got it sitting on 4x4's and pavers, with a dirt floor. The heavy rain today has almost convinced me to pour a concrete floor for it (there's a flash flood warning out too). I've read most of the threads regarding concrete floors vs dirt, shavings, etc, but they're not very recent. What do y'all think, entire concrete (with 4-5" of shavings), or keep the dirt floor as is? Is 4-5" of shavings enough, or should I use dirt?