Something else that might work and would not be all that expensive is an inexpensive plastic painters tarp under the shavings to block any wind that comes through the flooring. I do my brooding in an gable off an unfinished room above my garage. It is about 8 x 12 and has a plywood floor. I got a cheap plastic tarp at the hardware store (less than 10 dollars) and put in down then put the shavings on top of it (and for brooding chicks put an old sheet on top of that for the first few days). It is easy to clean up when brooding is over (just gather up the corners and drag everything out to the burn pile), keeps anything from seeping through and soaking into the plywood floor and blocks any drafts from the garage below. You just want to make sure any liquid gets absorbed by the shavings and does not pool on the tarp. Just a thought.I have thought about that, and thank you for the suggestion. The coop is higher off the back end and fairly close to the ground at the front due to our slope. Not sure what type of insulation we could put that they wouldn't eat-anything like foam or fiberglass would have to be covered as well because they go underneath. Have also thought about those big rubber horse mats for stalls to put under the shavings for shock absorption as well as added warmth, but not sure I can afford it. Will look into it, though. His side of the coop is 8x8.