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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 difference between trusses and rafters. Do you know the difference between roof trusses and rafters? Rafters, or conventionally framed roofs, are historically how roofs were built. Itâs usually 2â³x6â³ or 2â³x8â³ lumber put together on the job site by a general contractor to form the roof. In Florida they cannot consist of any structural member smaller than 2â³x6â³.