Ok we are stumped. My husband is building our coop using mostly scrap wood on top of an existing cement floor. He was planning on using 4x6's around the base (originally it was going to be like a log cabin design). How do we keep rain from flowing under the wood? This is our first time building a coop and are trying to work w/materials we have so forgive our ignorance. I was thinking we could put the trim they put at the bottom of a garage door around the base. Anyone else build on concrete and any other advice?