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Size your deck beams and headers with our easy-to-use span table, which allows you to cross reference the post spacing and joist length to determine the right deck beam size. Try it out at Decks.com.
If you’re using the beam sizing tables in older versions of the International Residential Code (IRC), you’re probably oversizing your deck beams. In this article, I’ll focus on how to read the new maximum deck beam span tables in the 2021 IRC, and explain how to use the code’s new “joist span factors” table to determine the ...
Calculating and finding the right size of beam to use on your deck depend on different factors; The size of the deck itself. The species and quality of the timber that is being used. The number of joists that will sit atop deck beams.
This code and deck beam span chart simplifies sizing deck beams for 2-ply and 3-ply built-up beams, ensuring proper construction and safety.
Determine what size deck beam you need based on your support post spacing, as well as the proper concrete footing diameter, with our beam span calculator at Decks.com.
Once you know the distance between support posts and the length of the joists that will be supported you can determine the required size by checking our beam-sizing chart. The size of a beam is a function of the amount of weight it must support and the distance it must span.
See the Deck Post Size Table to make that determination because it will affect the size of beam you choose. The Deck Beam Span Table on this page makes it easy to determine how far apart your posts and therefore the span of the beam should be.