A picture would really help. It sounds like you are asking about a “California” valley, which is a valley framed over an existing roof. To build one, set two of your new common rafters opposite each other, then level your ridge back to the point where it meets the existing roof (assuming your new walls are level!). Then snap lines on either side to the point(s) below where your two roofs meet. Lay some flat sleepers, usually a couple of 1×6’s side by side, just inside your chalk lines.
Then mark your layout for your jack rafters on your ridge and sleepers, following your o.c. spacing. Measure and cut your jack rafters, with your 5:12 (if 5:12 is the pitch chosen for your new roof) angle at the ridge (22.5 degrees), and the angle created by a perpendicular (to the ridge) line at the bottom (67.5 degrees). Set your circular saw at 22.5 degrees when you cut the bottoms, so the rafters are beveled to match the pitch of the roof they’re sitting on.
Nail the rafters in place, and you’re ready for roof sheathing and fascia.
“he…never charged nothing for his preaching, and it was worth it, too” – Mark Twain
Edited 3/22/2006 1:46 pm by Huck
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No problem there man. Get a speed sqaure and actually draw it out on wood and in yer noggon, then ya get the warm fuzzies that you know you know more than I do.
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