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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.
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.
Refer to the Deck Beam Span Table below to assist in determining the maximum span of a given beam between posts. Obviously, the larger the beam, the greater the distance it can span between posts. A Redwood 4x6 beam should span no more than 6' between supporting posts.
But if your deck design has a flush rim beam without any cantilever, or if the cantilever is less than the maximum allowed, then you can employ the new “joist span factors for calculating effective deck joist span” to right-size the beam for your deck design and span greater distances between posts.
How Far Can a Deck Beam Span? It’s essential to comply with the building code to ensure proper deck post, footing, and beam spacing. To provide support for the joists, deck beams must span the entire length of the deck.
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.
Calculating Deck Beam Spans. The farther decking beam spacing is—the farther apart the posts are—the more massive a beam must be. The calculations below list approximate recommended deck beam spans. Beams made of two or more pieces are usually at least as strong as solid beams of the same size.
Recommended or allowable joist & beam spans: this article explains typical spans for deck joists, deck beams, and deck flooring, giving both standard span tables and a quick "rule of thumb" that works pretty well.
Deck joist spans are a fundamental aspect of deck construction. They refer to the distance between the supports that hold up the deck. The choice of these spans is not arbitrary. It’s based on a careful consideration of various factors. These include the type of lumber used, the load the deck is expected to bear, and the local building codes. ...