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Roof Span Chart

Roof Span Chart - Visit the roof framing page for. If you’re planning a pergola, patio roof, gazebo, or similar structure, an essential part is determining the number, size, and spacing of rafters, beams, and posts, according to. To achieve maximum indicated spans, trusses may require six or more panels. Tables 1 through 12 are abbreviated span tables for selected southern pine visual, machine stress rated (msr) and machine evaluated lumber (mel) grades. Additionally, compression perpendicular to grain. Section r802.4 outlines the wood roof rafter framing criteria which also includes prescriptive span tables. Use the span tables in the links below to determine the maximum allowable lengths of joists and rafters. We’ll discuss 16” and 24” spacing, how to calculate the number of rafters. Trusses with an asterisk (*) that exceed 14' in height may be shipped in two pieces. 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).

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