...but I haven't been able to find an acceptable answer to these questions: 1) Is it common practice to dig down a few inches when you put sand in your run, or do you put it right on top of the soil? I will have a roof over my run, so it shouldn't get too much rain. 2) I also want to put sand in my coop over a plywood floor. Will it make it too cold in the winter if I use sand instead of straw or wood shavings? I live in Utah where it is fairly hot in the summers (80-90 avg.) and fairly cold in the winter (20-25 degrees on average nights, but can dip to single digits on very cold nights). 3) Do you ever have to completely replace the sand, or do you just add more as necessary?