Window door garage door headers supporting roof wall floor loads.
Roof support beam span calculator.
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Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
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.
Most interior beams need to include the roof load.
In the example the beam spans the 10 foot width of the roof.
Fill in the parts of the formula that are already known.
F stands for the beam s fiber strength in bending which depends on the species of wood.
The values displayed in the resulting table will show nine possible maximum beam spans for the supported length selected.
Span calculator for wood joists and rafters also available for the android os.
Window door garage door headers supporting roof loads only.
Also available for the android os.
L stands for the span of the beam in feet.
For the initial calculation f can be estimated at 1 000.
For example a 3 ply 2x8 beam would use three 2x8s nailed together side by side.
Structural ridge beam span calculator posted on april 7 2020 by sandra open source wood find tools 4101 8 01 roof ceiling construction single span ridge beam ridge beams and boards modern technical steico construction.
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.
This calculator matches up with 90 of the applications in the 2012 international residential code book.
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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.
It has been my experience to never use a beam smaller than a two ply 2 x 8.
If there is are any questions about anything else then you should contact your supplier or an engineer.
