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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.
Rafter: Truss: The quality of Rafters is very good. The quality of Trusses is also very good. Rafters have shorter lead times. Trusses take longer to install but require less staff members to do it. Rafters tend to be built on-site in pieces; Trusses can be built in a factory and shipped to the location.