Porch Roof Beam Span Chart

Patio roof maximum beam rafter spans.

Porch roof beam span chart.

A 4 by 10 can usually span up to 12 feet between posts. Fill in the parts of the formula that are already known. 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.

The total load is 4 000 pounds. 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 wall floor loads. For more information see our disclosures here.

L stands for the span of the beam in feet. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. In the example the beam spans the 10 foot width of the roof. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.

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. Window door garage door headers supporting roof loads only. The smallest beams for patio covers are typically 4 by 6. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.