Porch Roof Beam Span Chart

Beam span calculator for help simply click on the beside the section you need help with watch this tutorial video.

Porch roof beam span chart.

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. This post may contain affiliate links. Patio roof maximum beam rafter spans.

Calculate the initial value for d then round it up to the nearest inch. A 4 by 10 can usually span up to 12 feet between posts. Window door garage door headers supporting roof wall floor loads. For more information see our disclosures here.

If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. The smallest beams for patio covers are typically 4 by 6. 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.

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. Window door garage door headers supporting roof loads only.