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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.
Always use the next size lumber up from rafters for the hip,valley rafters. If you are using 2 x 8 rafters use at least 2 x 10's for hip and valley rafters. If you are not sure of youself on cutting them do this: Take a board about 6' short of needed hip/valley rafter length and cut your top plumb cut on it. Cut it to an even number of feet, like 12' or 16'. Now Take a short pc. of board you are using for hip/valley rafters and cut your birdsmouth cut on it. Hold you hip/valley rafter in place and then place your shorter rafter with birdsmouth cut along side it and flush with the top. Now check how your birdsmouth fits on the plate, make any adjustments you need to get it to fit and be on plane with the common rafters.