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To find the length of your rafters, multiply the run in inches by the rafter length factor and divide by 12. For example: The run is 96 x 12.65 (length factor for a 4/12 roof) = 1214.4 divided by 12 =101.2 inches.Not quite done yet!dd that to the 102.2 inches (101.2 plus 14.75 = 115.95 or 116 inches). Your rafters will need to be at least 116 inches long. Porch Home / Build a Porch / Roofing Materials Comparison. If your rise and run (or slope) is 4/12, multiply the square footage above (504) by 1.06.
The number of common rafters in a hip roof are restricted to the length of the ridge with the. rafters on either side, at the end of the ridge, being referred to as centering rafters. The rafters may be set out using a variety of methods including use of the steel square, full size. set out and by calculation.