Originally Posted by ugabulldog
thanks and thanks........... I had an old framer tell me once that instead of subtracting 3/4" (half the ridge board) he only subtracted 1/2" so the rafter would set tighter against the ridge. He showed me this after my rafters/ridge fits had a gap at the bottom. Any comments on that??
That doesn't make any sense. If you subtract 1/2 the thickness of the ridge and cut the rafter the right length and your walls are parallel the rafter will fit perfect without any gaps. If you had a gap, you must have something wrong with the length of your rafter or the plumbcut wasn't right, or the walls bowed.
With a 15' run and a 2x ridge, you effective run is 14' 11-1/4". 8/12 pitch, your rafter length to the outside of the top plate will be 17' 11-7/16". Your 1' overhang, add another 1'2-7/16".