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Roof Rafter Span Chart

Roof Rafter Span Chart - Additionally, compression perpendicular to grain. Use the span tables in the links below to determine the maximum allowable lengths of joists and rafters. Visit the roof framing page for. These span tables for joists and rafters are calculated on the basis of a series of modulus of elasticity (e) and bending design values (f b). Roof rafter size and thickness shall be determined in accordance with the limits set forth in table r804.3.2.1 (1) based on the horizontal projection of the roof rafter span. Only with ceiling joists located near the base of the rafter at the bearing wall (1/7.5 or less) Maximum rafter span chart rafter span tables use these two tables for roof rafters with a slope of 3 in 12 or less. Spans are measured as the horizontal distance between supports, including purlins. These tables provide maximum spans for the #2 grades of four common species of. Surveyors and structural engineers utilise data from tables below to help calculate the correct size, strength and centres of roof timbers for the required spans and loadings.

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