Window door garage door headers supporting roof loads only.
Porch roof beam span calculator.
Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
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This number represents the total load that your roof must carry.
It has been my experience to never use a beam smaller than a two ply 2 x 8.
Use this calculator to find out the beam span and deck footing size for your project.
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Beam span calculator for help simply click on the beside the section you need help with watch this tutorial video.
If there is are any questions about anything else then you should contact your supplier or an engineer.
A 2 2x10 can span 10 feet and so on.
A double 2x12 beam can span 12 feet.
Most interior beams need to include the roof load.
When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
According to our beam span chart resource the span of a beam is dependent on a few variables.
Window door garage door headers supporting roof wall floor loads.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Dimensional lumber deck beam span chart.
Multiply the load per square foot by the total area of the roof.
Multiplied by 40 pounds per square foot equals 8 000 pounds.
The species of lumber size of lumber and the load it carries.
This calculator matches up with 90 of the applications in the 2012 international residential code book.
The numbers in gray indicate the distance between the support posts.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
If an example roof is 10 feet by 20 feet the total area is 200 square feet.
