![]() ![]() Question 1: if I’m reading the span tables correctly (and I may not be), two 2x10. of Visually Graded Southern Pine Dimension Lumber Maximum spans in feet-inches. Roof pitch is 6:12 with architectural shingles and solid sheathing. The first span table is for roofs where the ceiling is not attached to the rafters (with no snow load), a live load of 20 Psf, a dead load of 20 Psf, and a deflection limit of L/180. ![]() 2 The spans for other species in these graphs were calculated using current design values for those species as of February 2013. Common, jack, and hip rafters will be 2x8 spaced 16 on center. The Southern Pine spans in these graphs were calculated using the new design values which become effective June 1, 2013. 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. The Southern Pine Inspection Bureau published new design values for all sizes and grades of visually graded Southern Pine dimension lumber in Supplement No.13 to the 2002 Standard Grading Rules for Southern Pine Lumber. Planning a 12’ x 14’ hip roof (outside to outside), set on 6圆 pressure treated southern yellow pine 2. Table 1: Visually Graded Dimension Lumber 2 to 4 thick, 2 and wider Table 2: Mechanically Graded Lumber 4 thick or less, 2 and wider Table 3. _ (species of wood), what would be the minimum for a slope of less thanĪt any rate, 2x8 rafters will typically span almost 14 ft. Table 1 provides the design values for visually graded Southern Pine dimension lumber that became effective June 1, 2013. I have a porch with a span of _ feet with 2x8 rafters at 24" on center using The information that you did not provide us is the span of the enclosed porch. Rafter spacing is typically 16" for stick frame and 24" for trusses. 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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