I'm still working out my coop design and thought I'd ask for some input. I've gotten "tower clearance" to put the coop and run on the 10'X20'x2' concrete pad in my back yard (the previous owner had a HAM radio tower). The chickens will be free ranging most of the time, but will be confined to the coop/run when I'm not home so I plan to put the whole thing on pressure treated 4"x6" landscape timbers and fill it in with sand. My question is: Do I still need to put hardware cloth around the base of the coop or under the timbers in the run? I cant imagine anything being motivated enough to dig through 2' of concrete, but how often do predators try to get through the sides? I'm in south eastern CT and I know for a fact that there's a pack of coyotes that spend the summer in a nearby field. I've also seen foxes, opossum, raccoons and skunks, and have heard the occasional fisher cat in my area. Will a multiple strand electric fence strung along the bottom foot or so be enough of a deterrent to keep them out? Not sure what else is roaming around, but I live on a lake, so snakes and various rodents are pretty likely, too. Also- I'm thinking about doing the deep litter method through the winter and take advantage of the heat from the composting manure. Will I need to insulate the floor, given that its being built over concrete? Or will a thick layer of pine shavings in the coop be enough to get them through the winter? Should the walls and ceiling be insulated as well? Winter temps average between 20 and 30 degrees here, with a 2 week cold snap in February that sees nights a few degrees below zero. That leads me to my next question: Ventilation. Will ridge vents work? Where, exactly, do you put the other vents so its ventilated without being drafty? Thoughts??