Porch Roof Beam Span Table

Tables 7 12.

Porch roof beam span table.

F stands for the beam s fiber strength in bending which depends on the species of wood. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. In the example the beam spans the 10 foot width of the roof. The figures are based on quality materials.

Download a pdf. Includes size and spacing tables for load bearing and links to related articles. 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. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. For the initial calculation f can be estimated at 1 000. Jan 15 2017 a simple buying guide for beams and rafters that support patio roofs. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.

L stands for the span of the beam in feet. Fill in the parts of the formula that are already known. Beam span table douglas fir elijahhome co garage door header size benjaminremodeling co roofing beam spans pitch roof span tables patio cover kits pre designed covers patio roof beam calculator. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

The total load is 4 000 pounds. The tables below give maximum spans for rafters and beams. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. The smallest beams for patio covers are typically 4 by 6.