In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
Patio cover patio roof beam span table.
The tables below give maximum spans for rafters and beams.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
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Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Choose the appropriate span table.
The figures are based on quality materials.
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Jan 15 2017 a simple buying guide for beams and rafters that support patio roofs.
Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
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For free standing canopies of any height up to 3 2m use the span table marked below with an asterisk.
The smallest beams for patio covers are typically 4 by 6.
Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.