Porch Roof Beam Span Chart

Calculate the initial value for d then round it up to the nearest inch.

Porch roof beam span chart.

In the example d calculates to 7 75. Window door garage door headers supporting roof loads only. This post may contain affiliate links. The smallest beams for patio covers are typically 4 by 6.

Window door garage door headers supporting roof wall floor loads. Beam span calculator for help simply click on the beside the section you need help with watch this tutorial video. For more information see our disclosures here. This tells you the size of the beam needed to support the porch s roof.

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. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.

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. This means the example porch would need a 6 inch by 8 inch beam. 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.