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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.
A normal gable overhang is usually 12 to 24 inches wide. It is made up of rafters that are called fly rafters and are constructed of either 2x or 1x lumber. The fly rafters are usually one size smaller in width than the rafters used to frame the main roof. If the roof was framed with 2x8'sthe fly rafters would be 2x6's.