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<br />4. Maximum loads: Roof dead load of 20 psf and live load of 20 psf, <br />floor dead load of 10 psf and live load of 40 psf, and wall dead load <br />of 11 psf. <br /> <br />TABLE 2308.3C <br />HEADER SPANS {1} FOR EXTERIOR BEARING WALLS <br />(MAXIMUM HEADER SPANS FOR DOUGLAS FIR-LARCH, HEM-FIR, SOUTHERN PINE, <br />AND SPRUCE-PINE-FIR{2} AND REQUIRED NUMBER OF JACK STUDS) <br /> <br />Bui1dinq Wi.dth{3} (ft) <br /> <br />20 <br /> <br />28 <br /> <br />36 <br /> <br />I Headers Supportinq: I Si.ze Span NJ Span NJ Span NJ <br /> Roof, Ceiling 2-2x4 2-7 1 2-3 1 2-0 1 <br /> & 2 Center- <br /> Bearing Floors{4} 2-2x6 3-9 2 3-3 2 2-11 2 <br /> 2-2x8 4-9 2 4-2 2 3-9 2 <br /> 2-2x10 5-9 2 5-1 2 4-7 3 <br /> 2-2x12 6-8 2 5-10 3 5-3 3 <br /> 3-2x8 5-11 2 5-2 2 4-8 2 <br /> 3-2xl0 7-3 2 6-4 2 5-8 2 <br /> 3-2x12 8-5 2 7-4 2 6-7 2 <br /> 4-2x8 6-10 1 6-0 2 5-5 2 <br /> 4-2xl0 8-4 2 7-4 2 6-7 2 <br /> 4-2x12 9-8 2 8-6 2 7-8 2 <br /> Roof, Ceiling 2-2x4 2-1 1 1-8 1 1-6 2 <br /> & 2 Clear Span <br /> Floors{4} 2-2x6 3-1 2 2-8 2 2-4 2 <br /> 2-2x8 3-10 2 3-4 2 3-0 3 <br /> 2-2xl0 4-9 2 4-1 3 3-8 3 <br /> 2-2x12 5-6 3 4-9 3 4-3 3 <br /> 3-2x8 4-10 2 4-2 2 3-9 2 <br /> 3-2xl0 5-11 2 5-1 2 4-7 3 <br /> 3-2x12 6-10 2 5-11 3 5-4 3 <br /> 4-2x8 5-7 2 4-10 2 4-4 2 <br /> 4-2xl0 6-10 2 5-11 2 5-3 2 <br /> 4-2x12 7-11 2 6-10 2 6-2 3 <br /> <br />NOTIIS : <br /> <br />NJ - Number of jack studs required to support each end. Where the number <br />of required jack studs equals 1, the header may be supported by a framing <br />anchor attached to the full-height wall stud. <br />