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https://www.decks.com/how-to/40/beam-span-chart-table
Beam span maximums are based on a maximum anticipated live load. Building codes for residential decks only require 40 psf. The longer the joist, the more area of deck the joist supports, and thus the beam supports.
https://www.bhg.com/home-improvement/deck/building/how-to-compute-deck-spans/
Span requirements listed on the accompanying table ensure your deck won't sag or collapse during a party or under snow load. Codes specify maximum spans according to the type of wood used. A deck more than 2 feet or two steps above ground must have a …
https://homeguides.sfgate.com/recommended-beam-joist-spans-deck-framing-68584.html
Recommended Beam & Joist Spans for Deck Framing Beam Span. The recommended span of a given beam is also determined by the dimensions of the timber,... Joist Span. The maximum distance a deck joist can span between supports is determined by... Cantilever. A cantilevered joist has an end that ...
https://www.decksgo.com/deck-beam.html
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.
https://www.decksgo.com/deck-joist-span.html
Refer to the Decking Span Table to determine what is the maximum distance that your chosen decking can span between joists. For example 2x6 materials can usually span 24” without any noticeable deflection and still support a significant load.
https://www.finehomebuilding.com/2015/03/08/how-far-can-a-deck-beam-span
When building a deck with 7-ft. joists, you know the beam can span somewhere between 7-7 and 8-0, but you don’t know exactly where. Check with your local code official, or simply drop back to the shorter value in the table and assume the allowable span is 7-7.Author: Mike Guertin
http://decks-ca.com/Deck_Beam_and_Post_Sizes.html
I put the built-up beam span table below but I would very rarely use a built-up beam in an exterior application where they are exposed to the moisture conditions like a deck. With the min. code for nailing they will still check, may warp and will shrink at the splices which allows moisture to get trapped with dirt promoting the compromise of the beams over time.
https://www.decks.com/how-to/41/deck-joist-sizing-and-spacing
In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. The larger the deck, the larger the joists. In typical deck construction, with a ledger on one side of the joist and beam on the other,...
https://build.decksgo.com/calculators/beam-span-calculator.php
Beam Span Calculator For help, simply click on the beside the section you need help with, watch this Tutorial Video. Lumber Species Southern Pine Douglas Fir Douglas Fir-Larch Hemlock-Fir Spruce-Pine-Fir Redwood Western Cedar Ponderosa Pine Red Pine
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