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START WITH 90 DEGREES SO A 40 D PITCH ROOF= 40d PLUMB/ TOP/ RIDGE CUT, THE SEAT CUT WILL BE 50 DEGREES ( 40D +50D=90DEGREES). So a 20 foot wide building with a 40 degree pitch = 40 d ridge angle and 50 d seat angle (wall plate) just square off the 50 d to get the bird mouth ( 1/3 depth of rafter). CUT ROOFING IS EASY IF YOU KNOW THE BASICS, FIRST THING NOT MENTIONED HERE IS ANGLES..IE COMMON 40 DEGREE ROOF PITCH...
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