My coop is 6x8 and 6' high with exterior nest boxes. I've insulated the walls of the coop, the nest boxes are insulated top to bottom (i.e. floor, walls and lid). I'm not insulating the pop door because I don't see how it would slide up and down and would have to be too thick, and it's so small I can't see where that much heat would be lost from it. Would I need to insulate the clean-out door under the roosts? It's about 12" high and 30" long. My problem is that if I make them out of 2x4 and insulate like a wall with fiberlas insulation, then they won't swing open and close because they'd be too thick? Same with the door. I'm running out of time and just can't make up my mind on how to proceed at this point. I was thinking of making thinner clean-out and human door and maybe insulating with that foam sheet stuff. Any opinions are appreciated!