I like in Upstate NY and I am working on a new design for my coop. My current coop is about 5 years old and I built it quick and on a budget. I used TPO roofing for the floor and it has mostly been great to clean up after, though now I am wondering if I need it. I am in a fairly sandy area and I was thinking about building the coop 2' below grade with no floor. My thought on this is warmer in the winter (our frost line is 4') and cooler in the summer based on the grounds temperature. We have 32 laying hens and they sure like to poop. With the natural sand bottom I thought it would be faster/easier to clean and can also go over the floor with more sand. Also I have my waterer in the coop and there are some regular drips when they are all using it. With a dirt floor it would dry faster and create less of a mess. I plan to use 1/2" 4'x10' sheets of cement sheet siding and running it 2' below grade to keep pests out. I also plan to build at least a 12" overhang on all sides to keep water away from the coop. I own a construction company so sourcing materials is not difficult, just looking for some great ideas that will last a while. Thank you!