Where the top of the header or girder is not laterally braced (for example, cripple studs bearing on the header), tabulated spans for headers consisting of 2 × 8, 2 × 10, or 2 × 12 sizes shall be multiplied by 0.70 or the header or girder shall be designed. defer r802.5.1(3) - rafter spans since common lumber species. Listed be 46 tables based on common loading conditions by floor joists, ceiling floor and rafters. Spans are calculated assuming the top of the header or girder is laterally braced by perpendicular framing. are not met, use the single span tables for the purpose of obtaining the appropriate size. Simplified maximum span tables for selected visual and mechanical grades of Southern Languish lumber in available 2×4 thorough 2×12.Use 30 psf ground snow load for cases in which ground snow load is less than 30 psf and the roof live load is equal to or less than 20 psf.Where the number of required jack studs equals one, the header is permitted to be supported by an approved framing anchor attached to the full-height wall stud and to the header. NJ = Number of jack studs required to support each end.For widths between those shown, spans are permitted to be interpolated. hese span tables for joists and rafters are calculated T on the basis of a series of modulus of elasticity (E) and bending design values (F b). Building width is measured perpendicular to the ridge.2 grade lumber of Douglas fir-larch, hem-fir, Southern pine and spruce-pine fir. Spans are based on minimum design properties for No. Roof, ceiling and two center-bearing floors Roof, ceiling and one center-bearing floor (Maximum spans for Douglas fir-larch, hem-fir, Southern pine and spruce-pine-fir and required number of jack studs) GIRDERS AND HEADERS SUPPORTING HEADER AND GIRDER SPANS a, b FOR EXTERIOR BEARING WALLS
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