You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Patio roof beam span calculator.
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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.
F stands for the beam s fiber strength in bending which depends on the species of wood.
It has been my experience to never use a beam smaller than a two ply 2 x 8.
For the initial calculation f can be estimated at 1 000.
The total load is 4 000 pounds.
Patio roof maximum beam rafter spans.
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Most interior beams need to include the roof load.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
If there is are any questions about anything else then you should contact your supplier or an engineer.
The smallest beams for patio covers are typically 4 by 6.
In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.
If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.
This calculator matches up with 90 of the applications in the 2012 international residential code book.
For more information see our disclosures here.
Also available for the android os.
Fill in the parts of the formula that are already known.
An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry.
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In the example the beam spans the 10 foot width of the roof.
A 4 by 10 can usually span up to 12 feet between posts.
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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