![]() ![]() Extreme Fiber Stress in Bending - Fb (Fig. In addition Fc and Fv are included as a consideration for selec-tion of joist and rafters. 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. These span tables are calculated based on MOE and Fb values. TABLE R802.5.1 (1) RAFTER SPANS FOR COMMON LUMBER SPECIES (Roof live load 20 psf, ceiling not attached to rafters, L/ 180) RAFTER. ![]() _ (species of wood), what would be the minimum for a slope of less thanĪt any rate, 2x8 rafters will typically span almost 14 ft. The braces shall be spaced not more than 4 feet (1219 mm) on center and the unbraced length of braces shall not exceed 8 feet (2438 mm). I have a porch with a span of _ feet with 2x8 rafters at 24" on center using Ceiling Joist Span Tables - Utilize these tables to ascertain the maximum span of a ceiling joist, predefined the size, clearances, species, press grade of lumber used. The information that you did not provide us is the span of the enclosed porch. Rafters act as support for roofs of houses, sheds, porches, cabins, and garages. Rafter spacing is typically 16" for stick frame and 24" for trusses. Roof Rafter Spacing, Span, and Sizing Explained. TABLE RAFTER SPANS FOR COMMON LUMBER SPECIES (Ground snow load 30 psf, ceiling not attached to rafters, LIA DEAD LOAD 10 pst SPECIES AND GRADE inches) 6 10 5- 3 7 5 5 5- 7 5 -2 7 10 1 6- 7 inches) 11 10 10- 2 12 5. Stud spacing is usually 16" and at times 24" on center. Most species used in residential construction are Pine, Spruce, Fir.įloor Joist spacing is usually 16", 19.2" and 24" on center.
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