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Posted by Paul (in CT) [68.195.245.26] on Friday, March 19, 2010 at 13:52:22 :
In Reply to: O.T. question for carpenters posted by D Sherman [216.18.131.188] on Friday, March 19, 2010 at 03:06:52 :
If it is not a standard angle, rafter tables are not much help. The plumb cut and seat cut (or bird's mouth) at the perimeter wall should be the same for all of the common and jack rafters (3:12). The angle of the plumb cut where the jack hits the hip will also be the same as the plumb cut on the end of the rafter where it meets the ledger on the wall. If you temp up the jack parallel to one of the commons, a bevel guage will give you the angle for your circular saw. If you do not have a bevel guage, use a scrap of wood to strike a line on the jack parallel to the hip for your angle cut. Use a scrap for a test cut to make sure it fits. After your test rafter fits, layout the spacing of the jacks on the hip and measure from the sill back to get your lengths.