Porch Roof Beam Span Chart

If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.

Porch roof beam span chart.

In the example d calculates to 7 75. 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. For more information see our disclosures here.

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. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Beam span calculator for help simply click on the beside the section you need help with watch this tutorial video.

This means the example porch would need a 6 inch by 8 inch beam. Window door garage door headers supporting roof wall floor loads. A 4 by 10 can usually span up to 12 feet between posts. This tells you the size of the beam needed to support the porch s roof.

The smallest beams for patio covers are typically 4 by 6. 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. This post may contain affiliate links.