The smallest beams for patio covers are typically 4 by 6.
Patio cover patio roof beam span table.
For free standing canopies of any height up to 3 2m use the span table marked below with an asterisk.
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.
Jan 15 2017 a simple buying guide for beams and rafters that support patio roofs.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Includes size and spacing tables for load bearing and links to related articles.
Build your patio cover or deck designing with roof rafter span tables board can span 16 ft for a wall pergola patio roof maximum beam rafter spanspatio roof beam calculatorpatio coversplease plete.
Monoslope empty under average roof height h patio height hc 3 h 4 4 h 5 5 h 6 5 hc 2 3 d a a 2 4 hc 2 8 f c a 2 8 hc 3 2 g e b monoslope blocked under.
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.
The figures are based on quality materials.
While your beam size ultimately depends on design factors such as whether you include a covered roof structure or open lattice strips a familiarity with conventional beam spans gives you an idea of how far apart you can space your posts.
In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
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You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.