Laying Out Rafters
In a pinch I resorted to some good old geometry, which was easy enough but did require things like knowing how to calculate angles etc.
Here is a site to look at:
As far as your ridge connection that has to do with the square & level of the building if you are cutting the commons the same.
I think the best bet for you would be to go and buy a Swanson Speed Square with the "blue book"
As far as the math goes there are construction calcualtors that all you do is put in the run & rise it will tell you the rafter length, angles, steps, etc.
On my site as well there are a few projects that go through the roof framing step by step with images.
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