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Sizing deck beams got a lot easier with the publication of the 2015 International Residential Code. Deck builders can now refer to Section R507.6 Deck Beams and Table R507.6 Deck Beam Span Lengths to determine the size of 2-ply and 3-ply built-up beams made from 2×6 through 2×12 lumber. These values didn’t change in the 2018 version of the IRC.

Joist Spacing for Trex. Trex recommends deck joist spacing of 12 inches or 16 inches on center, depending on the deck board size, although it says 24 inches is acceptable for decks with 100psf or less. Timbertech Joist Spacing. TimberTech's suggested deck joint spacing is 16 inches. However, its MAX deck boards allow 24 inches on center.

The International Residential Building Code (IRC) has strict requirements for deck beams and deck beam spacing. First, the IRC only allows certain dimensional lumber to be used for deck beams. In the past, 4x4s and 6×6 lumber could serve as beams, that is no longer the case. You must use 2x material bolted together to create a deck beam, or ...

If you have seen the Deck Joist Span Table, you already understand the relationship between joist span and joist spacing. The closer you space joists, the longer you can span joists – up to a point. For determining beam spans (distance a beam can span between supporting posts), consider the following concept.

Example: a = 12'; Post spacing # 8' Use the joist span table to find the acceptable joist sizes for a 12' span, 2x8s at 12" O.C., 2x10s at 16" O.C., or 2x12s at 24" O.C. Use the Beam and footing sizes table and find the 8' post spacing column. With a 12' deck span, the beam may be either two 2x8s or two 2x10s, depending on the wood used.

How to Use a Deck Beam Span Chart for Deck Building. A deck beam span chart is a handy little tool that helps you determine the right size and spacing of beams for your deck. It simplifies the process by providing clear guidelines based on the type of lumber, its size, and the load it needs to support.

1. Supported joist length is half the sum of joist spans on both sides of the beam. 2. Lumber used for joists, trusses, rafters and beams shall be identified by a grade stamp to indicate its grade as determined by the Standards Grading Rules for Canadian Lumber. Decks October 2013 Design: HRM Corporate Communications, KLW (use Diagrams 2 and 3 ...

For calculation of effective deck joist span, the actual joist span length shall be multiplied by the joist span factor in accordance with Table R507.5(5). TABLE R507.5(5) JOIST SPAN FACTORS FOR CALCULATING EFFECTIVE DECK JOIST SPAN [for use with Note j in Tables R507.5(1) , R507.5(2) , R507.5(3) and R507.5(4) ]

Figure 2. Joist Span – Non-Ledger Deck. BEAM SIZE & ASSEMBLY REQUIREMENTS Deck beam spans shall be in accordance with Table 3 and can extend past the post face up to LB/4 as shown in Figure 3. Joists may bear on the beam and extend past the beam face up to the lesser of LO or L/4 as shown in Figures 1A and 2, or the joists may attach to the ...

Deck Beam Span & Footing Size. Deck beams and joists go hand-in-hand as the framing materials for your deck. While joists provide a horizontal support system for deck boards, beams provide support for the joists. Your beams will need to bear the load of not only your decking materials, but additional components of the frame itself.

As a rule, the larger the deck, the larger the joists. For example, joists spaced 16 inches from the center of the joist next to it can span 1.5 times in feet the depth of their inches. To learn more about deck joist sizing, spacing, and allowable span, reference this chart. Choosing Wood for Your Joists

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Overhanging the beam past the footing will reduce their spacing. The IRC allows deck beams to overhang the post, one-quarter of the backspan. Meaning two footing spaced 8’ apart can support a deck 12’ wide. The beam overhanging each footing by one quarter, 2’. Minimizing the required footings. A word of caution, with beam overhang.

A Work in Progress. The 2015 IRC simplified sizing deck beams with the introduction of Table R507.6 “Deck Beam Span Length.” That table presented the maximum spans for a series of multi-ply, built-up-dimensional-lumber beams from a double 2x6 through a triple 2x12, with beam spans based on the span of the deck joists from the ledger to the beam.

PRESCRIPTIVE RESIDENTIAL WOOD DECK CONSTRUCTION GUIDE 5 American Wood Council Figure 1B. Joist Span – Joists Attached at House and to Side of Beam. Figure 2. Joist Span – Non-Ledger Deck. BEAM SIZE & ASSEMBLY REQUIREMENTS Deck beam spans shall be in accordance with Table 3 and can extend past the post face up to L B /4 as shown in Figure 3.

The size and the spacing of footings tie directly to the maximum spacing between posts of the beam they support. A larger beam can span a greater distance, requiring fewer but larger footings. The 2018 International Residential Code (IRC) contains a table for sizing deck beams, which allows me to determine how many posts I need.

Deck Beam Size Versus Joist Spacing. The size of the deck beam required and the spacing joists will be accorded as the thickness of beams is dependent on the amount of load it will bear immediately or afterward. Beam size and joist spacing work hand in hand to deliver a sensible and practical result.

The required width of a joist depends on its span: how far it must travel between beams or between a beam and a ledger. It also depends on the joist spacing. For instance, deck joist spacing 24 inches apart requires wider joists than deck joists placed 16 inches apart. See the deck joist calculations below and study your local code.

What is a Deck Beam Span Chart? A deck beam span chart is a reference tool used in construction to determine the maximum distance a deck beam can span without support. The chart considers factors such as the type of wood, the size of the beam, and the load it must support. Builders use these charts to ensure the structural integrity of a deck.