We're building our coop from salvage, and it's coming along okay. I've read all the posts on sand versus shavings, etc...but I wonder about a cement floor underneath it all. I want to be predator wary, of course, and it seems cement would shut them out entirely. Any drawbacks to a cement floor? Any recommendations? If I could afford it, would it be good to get the electric mesh to embed in the floor for cold Kansas winters, or is that just crazy over the top? I'm thinking if I pour it right, such a floor could just be hosed out and squee-geed once in a while, right? Thanks in advance for input.