Hello. I recently built a 6x16 coop and run. The run is the full 6x12 the hen house is off the ground. I live in iow and winters are cold. Below 0 at times with obvious snow. I'm planning on wrapping with plastic. But my main question is run flooring. Obviously I need to cover the dirt and keep it dry and not as cold. I'm not sold on sand because it will be colder. I've thought about hemp or pine pellets. I've heard bad things about straw and haw. Bacteria and mold. Anyhow. Looking for advise what others have done and what might be the best option. Thanks