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Roof Rafter Span Chart

Roof Rafter Span Chart - Only with ceiling joists located near the base of the rafter at the bearing wall (1/7.5 or less) Use the span tables in the links below to determine the maximum allowable lengths of joists and rafters. Spans are measured as the horizontal distance between supports, including purlins. 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. 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). We’ll discuss 16” and 24” spacing, how to calculate the number of rafters. 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. The irc provides 8 tables for rafter spans using common lumber species. Visit the roof framing page for. Section r802.4 outlines the wood roof rafter framing criteria which also includes prescriptive span tables.

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