Flat Roof Joist Span Tables Building Regs

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Notches are not to exceed 0 125 of the depth of the joist and are to be located between 0 07 and 0 25 of the span from the support.

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