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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.
2x4 rafters/roofing question... i helped a friend build his garage's roof, kinda of uncomfortable. he says lowes told him he could use 2x4 for rafters with 1/2 inches plywood for asphalt shingles. the rafters are 18 foot long without beams or trusses (garage 28x40).he's already got the 2x4 up for rafters and it's ready for laying plywood tomorrow.i told him plywood and asphalt shingles would be too heavy. he could get his money back for the plywood and do tin roof setup instead.he rafters are 18 foot long without beams or trusses (garage 28x40). he's already got the 2x4 up for rafters and it's ready for laying plywood tomorrow. i told him plywood and asphalt shingles would be too heavy. he could get his money back for the plywood and do tin roof setup instead.