A post which is kind of a cop-out because I wasn’t the one who put in the effort, but it’s worth mentioning.
The tarp mentioned in part 2 was not a permanent solution. A more permanent solution can be purchased with money: having some dudes come over and re-shingle the roof.
We got a few quotes and went with the best one. The dudes showed up right after a huge snow, so the first step was shoveling the garage. Then they got to work. It was pretty insane watching them go- these guys were roofing machines.
One kind of interesting effect was that when all the shingles on the garage were removed, the light shone through. It actually made the garage feel really nice, kinda makes me want some skylights. Whatever.
A few boards had rotted out, so we replaced them as the roofers went.
On the south side of the garage, there were some trees which had shaded the garage, and therefore an entire section needed to be replaced. Whatever. We got these trees removed, which was a bit sad cus they were kinda nice trees.
The only medium-big downer is that a lot of old shingle debris rained down between the cracks in the boards, which got all over the garage. I am still vacuuming this stuff up…
Anyways, now it doesn’t leak anymore. Yay!!