![]() ![]() Let me also say that you did not provide sufficient pictures to accurately assess you question… the span of the deck may be 12 feet…yet the rafters may be going back another 4 foot up the roof to get the 3/12 (probably 2/12) pitch, unless the framer busted the load down with bracing then your true span in the above scenario would be 16 ft. _ (species of wood), what would be the minimum for a slope of less thanĪt any rate, 2x8 rafters will typically span almost 14 ft. I have a porch with a span of _ feet with 2x8 rafters at 24" on center using The loads are based on adjusted roof snow loads from the governing building code. The information that you did not provide us is the span of the enclosed porch. Rafter spans are tabulated for the most common roof loads. ![]() Listed spans are for dry-service conditions unless the table is labeled as Wet-Service. The load duration factor, CD, is 1.0 unless shown as 1.15 for snow or 1.25 for construction loads. Deflection is limited to the span in inches divided by 360, 240 or 180 and is based on live load only. Rafter spacing is typically 16" for stick frame and 24" for trusses. Applied loads are given in pounds per square foot (psf). Stud spacing is usually 16" and at times 24" on center. (ringed in red. Most species used in residential construction are Pine, Spruce, Fir.įloor Joist spacing is usually 16", 19.2" and 24" on center. EXAMPLE: A rafter span of 4,80 meters for roof sheeting without a ceiling will require a 38X228 S5 Rafter.
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