Hi, I am new to having chickens and this will be my first winter. I am in Ottawa, Canada so winters suck here. I have 7 cold hardy chickens, that live in a 12x10 coop. The whole building is 12x16 and is tin. The coop has an outer layer of tin and an inner layer, but no insulation in between. The ceiling is 80% covered with tin and the rest is open to the roof ( which is shingles). I'm not sure what winter prep I should be doing. I know drafts are bad and its definitely not, and it has good ventilation. Also the roosts are 2x4s so they can cover their toes. I just don't know if I should insulate it or make a small insulated section around the roosts for them to stay warmer. Any suggestions