I have 3 coops with wood floors on which I use the deep litter method. Works great for me. I clean out twice a year and the smell is manageable. This fall I set up my large hoop house as additional winter housing. I set it on the slope of a hill. Within a week the chickens had all the grass gone. I gave them straw up on a wood pallet under the roosting area, but left the rest of the floor bare ground. The house is covered by two tarps but the east side (down slope) is open. The chickens weathered just fine in there even the few times it was below 0. But the ground has continually gotten gross with build of poo and straw. The straw soaks up the water from the ground. We are having a lot of spring rain and it seems to run down hill and down the outer walls and right in under the coop base. I've never had the hoop house get this bad. Last winter it housed turkey and stayed quite dry inside. In the summer when growing out poultry, I do move it often to give them access to grass, but even when I used it a couple months for ducks only a corner of the house got mucky. This experience just has assured me that I don't want to try a dirt floor in a permanent coop here in Ohio. I can't see any place on my property that I could keep it dry inside.