Porch Roof Beam Span Calculator

Rafter and ceiling joist forces.

Porch roof beam span calculator.

Two point loads at one third points on a simple beam. Simple beam point load at any location. Simple beam point load at midspan. Span calculator for wood joists and rafters also available for the android os.

Beam span calculator for help simply click on the beside the section you need help with watch this tutorial video. If an example roof is 10 feet by 20 feet the total area is 200 square feet. 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 loads only.

It has been my experience to never use a beam smaller than a two ply 2 x 8. Combined axial and bending load calculator. Also available for the android os. This calculator matches up with 90 of the applications in the 2012 international residential code book.

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. Window door garage door headers supporting roof wall floor loads. 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. Use this calculator to find out the beam span and deck footing size for your project. Most interior beams need to include the roof load. The species of lumber size of lumber and the load it carries.

Multiplied by 40 pounds per square foot equals 8 000 pounds. 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. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

This number represents the total load that your roof must carry. Uniformly loaded beam overhanging post 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.