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Are you referring to the angles of the notches where they go over the top of the wall? In construction you call those "bird's mouths" and I'll let you in on a little secret: They don't have to be perfect! We would take a 2x4, lay it flat on the top plate (i.e., top of your wall) next to the rafter, then draw a line across it. Then place the 2x4 against the outside edge of your wall and draw a vertical line. There's your cut! Like I said, it won't be perfect but trust me no one but you will ever notice! And if it bothers you, you can always Spackle the small gap before painting.
Are you referring to the angles of the notches where they go over the top of the wall? In construction you call those "bird's mouths" and I'll let you in on a little secret: They don't have to be perfect! We would take a 2x4, lay it flat on the top plate (i.e., top of your wall) next to the rafter, then draw a line across it. Then place the 2x4 against the outside edge of your wall and draw a vertical line. There's your cut! Like I said, it won't be perfect but trust me no one but you will ever notice! And if it bothers you, you can always Spackle the small gap before painting.