Those using this Span Calculator assume all liability from its use. While every effort has been made to insure the accuracy of the information presented, and special effort has been made to assure that the information reflects the state-of-the-art, neither the American Wood Council nor its members assume any responsibility for any particular design prepared from this Span Calculator application. Buildings in these high snow zones should be designed in accordance with accepted engineering practice. Douglas Fir-Larch Hem-Fir Southern Pine Spruce-Pine-Fir. Buildings in regions with ground snow loads greater than 70 psf should not use the prescriptive provisions of the governing building code without approval of the authority having jurisdiction. Welcome to the Anthony Forest Products Company, LLC POWERFUL SOLUTIONS Lumber Span Calculator.The Span Calculator does not address wind load or seismic load. Joists and rafters carry only combinations of dead load plus live load (D + L), dead load plus snow load (D + S), or dead load plus roof live load (D + Lr).Consult the local building code for specific requirements. ![]() Pergola Rafter Spans for 600 mm and 900 mm Spacing and. 3) For design parameters, refer to figure 6.22, AS1684.2 and 3. Member span is not suitable for rafter spacing greater than 600mm. These minimum bearing lengths are to be used in the absence of calculated bearing lengths. Notes: 1) Refer to general notes for information that is relevant for all span tables.
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