Hello I'm new to raising chickens. I just moved my 5 week old chicks into the new coop and I'm thinking about switching to sand. We laid vinyl flooring to keep the wood floor from rotting if I put sand in the coop do I need to add another liner or is the vinyl enough. (I'd hate to tell my hub we just spent $60 of vinyl when we need something else. Also Would sand be ok in a Western PA winter?