I've been hearing some roosters around my neighborhood and decided that I want some chickens as well. I have read as much as I could about coop design and have already built the majority of my coop. Being in the construction business I have a ton of leftover materials so I have done this completely for free I built a 4'x7' coop. I have built the elevated base and framed the 4 walls. It is framed for a single slant roof. I decided on this style roof as it would be the easiest for me to build as I wont need trusses, I can just use 2x6. My question comes as I have just read an article about ventilation and am trying to incorporate it into my roof design. I am trying to avoid putting a bunch of hatches on my coop for ventilation and would like to use the roof to do it for me. I live in colorado so I do need to worry about snow, rain, very cold temperatures as well as very hot temperatures during the summer. I want to insulate the roof as well as vent it on the high side to prevent moisture build up. I have an idea on a design but would like to know if any one has tried it first. I want to bird block between my rafters about 1' back on the high side so I can insulate the roof up to this point but provide a passage way for air above the high wall and out the soffit. I want to put the entire soffit on hinges so I can swing it open or closed as needed. That will give me 7sq ft of ventilation, all built in to the roof without ugly hatches all over my coop. Is 7sq ft enough? Too much? What is the magic number? I plan to start with 2 chickens but want the option of expanding to up to 8. Maybe I can split the soffit in 2 so i can open only half at a time? that would give me 3.5 sq ft if I only open one side or 7 sq ft if I open both halves. Is 3.5sq ft going to be too much for my 2 chickens? I don't want to freeze them it can get down to -15 or so during the winter. During the summer I have a 3'x4' window that I can open so I am not worried about then, just the winter as I cannot open that window as the wind would blow on their roost. Any advice would be appreciated.