The image is borrowed. The notch in the rafter is called the bird's mouth. I used a jig saw and circular saw to cut the bird's mouth. It didn't work. I sort of got one started. I used a chisel and mallet. That took a long time. I put the rafter on the roof and it didn't fit. I chiseled some more. I gave up on it and cut a line vertical first cut. I got something that seemed that it might work.
I clamped the rafters together and drew to lines. I made a saw kerf on each line about a half inch deep with a circular saw.
Here is another photo of the same, but on the opposite end.
I used a chisel to clean the wast. When I put the rafter on the headers. north end not fit. There is a faint line to the right of the cut out. I then removed more wood up to the line. This time it fit.
Here is a photo of the rafters in place. I fasted four of them to the north header with screws, and one of them with a lag screw.Comments and questions are welcome.
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