I’ve been framing for a while now and most things are pretty cut and dry with the exception of jack rafter spacing on different roof pitches. When I have an “A” California the same pitch I just use my rafter book. Usually on the houses I frame, they have an 8 on the main roof with a calafornia A on top, which is a 12. Or I have a room over the garage, which is the same thing except I have 2 king valleys running down from the ridge. This is also an 8-12 on the main roof and the other a 12-12. My question is how do you figure the jack rafter spacing. My stuff is 16″ on center so there is usually quite a few rafters to cut. When cutting them I always try figure it out mathematically, then get upset and end up taking my tape out and messuring them. I’ll be the first to admit it’s a pretty “cave man” way of doing it, but could someone please tell me the right way. I can get mine to work so everything breaks and there straight but I know there’s a better way out there.
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