Patio Roof Beam Span Table

Posts these span tables are designed for a minimum post size of 50 x 50 x 2 5mm up to a maximum height of 3 0m.

Patio roof beam span table.

For the initial calculation f can be estimated at 1 000. The figures are based on quality materials. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

The smallest beams for patio covers are typically 4 by 6. 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. 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.

Use recommended minimum roof pitches as specified by roof sheet supplier. The total load is 4 000 pounds. L stands for the span of the beam in feet. Fill in the parts of the formula that are already known.

If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. A 4 by 10 can usually span up to 12 feet between posts. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Jan 15 2017 a simple buying guide for beams and rafters that support patio roofs.

Table 9 1 in span tables for joists and rafters figure 5 gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1 5 inches. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. In the example the beam spans the 10 foot width of the roof. Tables 7 12.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Spantec has prepared these tables for use by people skilled in the design and specification of the. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. Flat roof span tables allow for a maximum roof pitch of 5º.

F stands for the beam s fiber strength in bending which depends on the species of wood.