Roof Support Beam Span Calculator

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Roof support beam span calculator.

The values displayed in the resulting table will show nine possible maximum beam spans for the supported length selected. Diy pergola guide measuring pergola dimensions learn measuring pergola dimensions learn pergola beam span calculator span tables for 8 x12 x24 western red. Span calculator for wood joists and rafters also available for the android os. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

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. 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. Window door garage door headers supporting roof wall floor loads.

Fill in the parts of the formula that are already known. For the initial calculation f can be estimated at 1 000. If there is are any questions about anything else then you should contact your supplier or an engineer. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

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. 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. For example a 3 ply 2x8 beam would use three 2x8s nailed together side by side.

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. In the example the beam spans the 10 foot width of the roof. L stands for the span of the beam in feet. The total load is 4 000 pounds.

It has been my experience to never use a beam smaller than a two ply 2 x 8. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.