Porch Roof Beam Span Chart

In the example the beam spans the 10 foot width of the roof.

Porch roof beam span chart. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. 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. 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. 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. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. L stands for the span of the beam in feet. For more information see our disclosures here.

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. Window door garage door headers supporting roof wall floor loads. 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. Fill in the parts of the formula that are already known. This post may contain affiliate links. The smallest beams for patio covers are typically 4 by 6.