L stands for the span of the beam in feet.
Roof support beam span calculator.
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While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator.
Window door garage door headers supporting roof loads only.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Window door garage door headers supporting roof wall floor loads.
Fill in the parts of the formula that are already known.
Span calculator for wood joists and rafters also available for the android os.
For the initial calculation f can be estimated at 1 000.
These nine beam spans are for built up beams made up of either 2x8 2x10 or 2x12 dimensional lumber nailed together as either 3 4 or 5 ply beams.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
This calculator matches up with 90 of the applications in the 2012 international residential code book.
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In the example the beam spans the 10 foot width of the roof.
Most interior beams need to include the roof load.
It has been my experience to never use a beam smaller than a two ply 2 x 8.
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.
The values displayed in the resulting table will show nine possible maximum beam spans for the supported length selected.
For example a 3 ply 2x8 beam would use three 2x8s nailed together side by side.
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.
If there is are any questions about anything else then you should contact your supplier or an engineer.
F stands for the beam s fiber strength in bending which depends on the species of wood.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
