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<br />(MAXIMUM HEADER SPANS FOR DOUGLAS FIR-LARCH, HEM-FIR, SOUTHElm PINE, <br />AND SPRUCE-PlNE-FIR{2} AND REQUIRED NUMBER OF JACK STUDS) <br /> <br />Building Width{3} (ft) <br /> <br />20 <br /> <br />28 <br /> <br />36 <br /> <br />I Headers Supporting: I Size Span NJ Span NJ Span NJ <br /> Roof, Ceiling 2-2x4 3-1 1 2-9 1 2-5 1 <br /> & 1 Center- <br /> bearing Floor{4} 2-2x6 4-6 1 4-0 1 3-7 1 <br /> 2-2x8 5-9 2 5-0 2 4-6 2 <br /> 2-2x10 7-0 2 6-2 2 5-6 2 <br /> 2-2x12 8-1 2 7-1 2 6-5 2 <br /> 3-2x8 7-2 1 6-3 2 5-8 2 <br /> 3-2x10 8-9 2 7-8 2 6-11 2 <br /> 3-2x12 10-2 2 8-11 2 8-0 2 <br /> 4-2x8 8-1 1 7-3 1 6-7 1 <br /> 4-2x10 10-1 1 8-10 2 8-0 2 <br /> 4-2x12 11-9 2 10-3 2 9-3 2 <br /> Roof, Ceiling 2-2x4 2-8 1 2-4 1 2-1 1 <br /> & 1 Clear <br /> Span Floor{4} 2-2x6 3-11 1 3-5 2 3-0 2 <br /> 2-2x8 5-0 2 4-4 2 3-10 2 <br /> 2-2x10 6-1 2 5-3 2 4-8 2 <br /> 2-2x12 7-1 2 6-1 3 5-5 3 <br /> 3-2x8 6-3 2 5-5 2 4-10 2 <br /> 3-2x10 7-7 2 6-7 2 5-11 2 <br /> 3-2x12 8-10 2 7-8 2 6-10 2 <br /> 4-2x8 7-2 1 6-3 2 5-7 2 <br /> 4-2x10 8-9 2 7-7 2 6-10 2 <br /> 4-2x12 10-2 2 8-10 2 7-11 2 <br /> <br />NOTES: <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 /> <br />1. Spans are given in feet and inches (ft-in). <br /> <br />2. Tabulated values assume #2 Grade lumber. <br /> <br />3. Building width is measured perpendicular to the ridge. For widths <br />between those shown, spans may be interpolated. <br />