The species of lumber size of lumber and the load it carries.
Porch roof beam span calculator.
Most interior beams need to include the roof load.
This calculator matches up with 90 of the applications in the 2012 international residential code book.
Dimensional lumber deck beam span chart.
Multiply the load per square foot by the total area of the roof.
If there is are any questions about anything else then you should contact your supplier or an engineer.
If an example roof is 10 feet by 20 feet the total area is 200 square feet.
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Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Use this calculator to find out the beam span and deck footing size for your project.
According to our beam span chart resource the span of a beam is dependent on a few variables.
Lumber species southern pine douglas fir douglas fir larch hemlock fir spruce pine fir redwood western cedar ponderosa pine red pine.
A double 2x12 beam can span 12 feet.
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.
This number represents the total load that your roof must carry.
The numbers in gray indicate the distance between the support posts.
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.
Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
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It has been my experience to never use a beam smaller than a two ply 2 x 8.
Window door garage door headers supporting roof wall floor loads.
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For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
A 2 2x10 can span 10 feet and so on.
