I did not include a ventilation system in my original roof design, and that's proven to be a real strain on my motivation. If I planned ahead properly, I would have opted to make a ventilation opening along the top ridge of the roof. But now it's all closed up, and I do not want to cut the ridge open. So I have to stop installing shingles for now and cut square holes to install aluminum vents. Here is the first of two vents I plan to install.