I am making and fitting valley rafters here at the big build, this is a job I really like and its really easy with a metric framing square.
The first job is to establish the angle for the plumb and seat cut, I set this out with my new simplified metric roofing and framing square. Using my fence clamped to the square I set the valley rafter angles and make a small template valley rafter to help with the marking out and defining the final lengths etc
Once this was set out and measured I returned to the wood stack and made two extended valleys with a traditional scarf joint to get them to the required length to form the valleys
Then I marked the valley out and cut them ready to fit. I also had a stud wall to birds mouth over for support
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