I'm planning on building a winter coop for my hens. I have 4 RIRs. The area already exists. At the back of my house I have a 6 foot by 6 foot area with 2 brick walls and a third wall now made of screen I intend to close with pressure treated wood. Now all I have to is build a front wall with a door and a window, and maybe some shelves. My question is what should I do for a floor? The floor is made of concrete. Should I just throw pine sheddings down and clean it every day? Seems like a lot of work. Maybe a sand base? I don't know what would be best. Any suggestions would be welcomed.