I started my small chicken coop at the side of my home where it is paved in bricks. I dropped hay and it was clean for about three days before flies and smell developed. The advantage was the ability to pressure wash the bricks. I moved the pen to a dirt floor area but it's gotten muddy and now have a supply of fire ants hanging around. Before I invest in flooring I seek advice. Slatted wood floor, bricks, or dirt? I was offered a suggestion of a layer of white sewer rock (from Home Depot), then a light layer of sand. This would allow washing and rain to drain. Then a thick layer of hay. But ants are still a problem. Ahhhh!!!