Metal Patio Roof Beam Span Table

Span tables are based on patio height and average roof heights as specified in the empty under and blocked under selection tables.

Metal patio roof beam span table.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Maximum patio height hc is 3 2m. In the example the beam spans the 10 foot width of the roof. The figures are based on quality materials.

For heights outside these ranges contact stramit for further information. R cb150 16 beam span table used w 3600 width of frame rafter span χ 6410 fascia beam span the cb150 16 beam achieves the 6000mm span for the fascia beam and can be used for the rafters. The total load is 4 000 pounds. The smallest beams for patio covers are typically 4 by 6.

Average roof height between 3m and 6 5m 3m h 6 5m. Attached flat roof 1ao page14. 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. A 4 by 10 can usually span up to 12 feet between posts.

In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. L stands for the span of the beam in feet. 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.

For the initial calculation f can be estimated at 1 000. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. The overlapping sections of the beam provide extra rigidity allowing longer spans between supports.

Fill in the parts of the formula that are already known. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. F stands for the beam s fiber strength in bending which depends on the species of wood.