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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.
Use these tables to establish lengths, sizes and spacing of rafters based on a range of factors such as, grade, spacing and pitch. Explore the tables we added below to help you in your DIY projects.Rafter Span, Roof Beam Span, Ceiling Joist Span, Floor Joist Span and Floor Beam Span.We recommend you check with your local building inspector to determine whether your local code isnât different.se these tables to establish lengths, sizes and spacing of rafters based on a range of factors such as, grade, spacing and pitch. Explore the tables we added below to help you in your DIY projects.