How do you go about pest-proofing an existing coop? We have two coops that we stopped using that are up in the grainery. They were fairly decent, but we had problems with coons breaking in and terrorizing the flock. We do not really NEED to use those coops, but I would like to get them nice and sturdy and maybe have them as an option. I would like to raise up some pullets to sell, plus breed a few purebreds and separate them out from other breeds. It would be nice to have more coops to utilize. Any advice?