Hey all! Well, I am in the process of building and planning and planning and building. Just a quick question: I am using 4x4 pallets for framing. I planned on building a outer wall and inner wall, about 3-4 inch gap between the two walls. I was planning on insulating the coop by using insulation within the gaps of the walls, and the making sure that the actual boards of the walls are seal to prevent my little bird brains from trying to peck at the insulation. What type of insulation do all of my lovely friends out here in BC use? If it helps, am in TN. Winters are not always cold, but are unpredictable. Thanks!!!