Porch Roof Beam Span Chart

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Porch roof beam span chart.

Fill in the parts of the formula that are already known. The smallest beams for patio covers are typically 4 by 6. Window door garage door headers supporting roof loads only. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.

A 4 by 10 can usually span up to 12 feet between posts. L stands for the span of the beam in feet. F stands for the beam s fiber strength in bending which depends on the species of wood. 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.

The total load is 4 000 pounds. Window door garage door headers supporting roof wall floor loads. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. Patio roof maximum beam rafter spans.

In the example the beam spans the 10 foot width of the roof. Build your patio cover or deck designing with roof rafter span tables board can span 16 ft for a wall pergola patio roof maximum beam rafter spanspatio roof beam calculatorpatio coversplease plete. For more information see our disclosures here. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.