My Dad has huge piles of scrap concrete and has already built a wall around his landscape and still has a bunch left. We are going in 50/50 on chickens and he would like to build the coop with the scrap concrete. He has both cinder blocks and random shaped similar sized pieces and we plan on pouring a cement foundation. The coop will be 8x8 in size. He has masonary books that I will have to pull out and the person who built the wall is around for questions but I have a few that you guys would be better at answering. I know stone can be cold but we live in central Florida so I am hoping it is not much of a concern with proper temp adjusting devices when needed in extreme cold and hot days. I am mostly concerned with leaving the cement exposed inside or putting up insulation and walls...hit me with your thoughts.