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Just make a plywood pattern, draw 12" and then up 4"(square),draw a line connecting the ends and you have a 4/12.
The above is called the level cut for the birds mouth and the raise of the rafter. For the ridge and the tails where the overhang is, is a 12/4 cut (plumb cut). It is all right here:
https://www.wikihow.com/Cut-Roof-Rafters
The above is called the level cut for the birds mouth and the raise of the rafter. For the ridge and the tails where the overhang is, is a 12/4 cut (plumb cut). It is all right here:
https://www.wikihow.com/Cut-Roof-Rafters
