Roof Support Beam Span Calculator

This calculator matches up with 90 of the applications in the 2012 international residential code book.

Roof support beam span calculator.

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. Also available for the android os. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Patio roof maximum beam rafter spans beamsmeasuring pergola dimensions learn the standardwhat is max distance between posts using 2x12x20 foot beams for apergola beam span calculator pergolacanopyideas pergolayou measuring pergola.

L stands for the span of the beam in feet. Fill in the parts of the formula that are already known. Most interior beams need to include the roof load. 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. 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. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Span calculator for wood joists and rafters also available for the android os. The total load is 4 000 pounds. 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. Window door garage door headers supporting roof wall floor loads.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Window door garage door headers supporting roof loads only. Diy pergola guide measuring pergola dimensions learn measuring pergola dimensions learn pergola beam span calculator span tables for 8 x12 x24 western red. 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. It has been my experience to never use a beam smaller than a two ply 2 x 8.