My neighbor has tried to keep ducks, chickens, and turkeys every year since I moved here and lost them all to predators. A huge part of the problem is her coop just isn't sturdy, this last set of birds were lost to predators who came right through the floor. We don't want to make that mistake, and our "official" coop is in progress although with the way the weather has turned, we probably won't be able to finish it until spring. Chooks are fine right now--the former owners put an "addition" on our modular that wasn't suitable for living space so it works well enough for now (we have an outside door between addition and house proper), but we want then to have a real coop that's located more conveniently to their range area. While we would have preferred a poured foundation for the floor, that's not practical for this first coop because we're probably going to need to move it when we build our new house. Instead, we poured concrete pillars 20" deep that rise above the ground about the height of a concrete block to anchor the structure (flying chickens are fine, but no flying chicken coops!), and got some concrete blocks to support the center of the beams. We have pressure-treated lumber for the floor joists since those will be exposed to the elements. It was important to have the coop off the ground because it can get very wet--it doesn't flood, we already spent time getting the area properly drained--but with heavy clay soil, even pressure-treated wood on the ground rots in record time. I'm thinking it will probably also help with potential rodent infestation because the cats can get under there if they so desire. Still, knowing that the predators came right up through the floor at my neighbor's, I was thinking that maybe my best bet would be to lay 1/2 plywood on the floor joists, staple down some hardware cloth for additional reinforcement, then put another layer of 1/2" plywood over that. Or would 3/4" plywood be enough? I'm not using ANY particle board like my neighbor did, the minute the stuff got the least bit damp, it started falling apart. We're also debating the feasibility of putting some kind of apron around the base of the coop--I've been browsing the site and see it's advisable to sink whatever you use into the ground so it's hard to dig under it, but then we get into the whole damp-ground thing and I'm not sure how well it would last. I also know we would have to use hardware cloth--the predators my neighbor had went through the chicken wire like it wasn't there, so it may not be cost-effective to do any apron other than plywood for additional heat retention in the winter months. After all the reading I've done, I think I am going to insulate the coop, I think it will help keep the coop from getting really hot in the summer as well as help keep it warm no matter how crazy the weather. What do you guys think? I appreciate your advice!