I used foam sign board laminated with hard plastic sheets on both sides to insulate walls floor and ceilings of my coops. The white plastic is easy to clean and parts are removed in summer to increase ventilation. Insulation keeps the coops warmer in winter and cooler in summer. I want my birds to do more than survive bad weather. I want them to thrive and be as comfortable as I can make them. I will admit I can get all the foam sign board I want as my family’s business is making Ultraboard.