Porch Roof Beam Span Chart

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

Porch roof beam span chart.

For more information see our disclosures here. An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry. A 4 by 10 can usually span up to 12 feet between posts. The total load is 4 000 pounds.

F stands for the beam s fiber strength in bending which depends on the species of wood. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Patio roof maximum beam rafter spans. Window door garage door headers supporting roof wall floor loads.

This post may contain affiliate links. 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. Window door garage door headers supporting roof loads only. For the initial calculation f can be estimated at 1 000.

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. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. In the example the beam spans the 10 foot width of the roof. Fill in the parts of the formula that are already known.