But let’s first explain what the numbers in the chart actually mean, because it can be a bit confusing. The Titan post anchor is the most advanced hidden wood post anchoring system of its kind. (Table 1:4) Deck Terminology Existing Foundation Deck Posts Maximum Height 4 X 4 or 4 X 6 Post - 8’ High- measured to the underside of the beam 6 X 6 Post - 14’ High- measured to the underside of the beam Deck Post to Deck Footing Requirements With a 12’ deck span, the beam may be either two 2x8s or … The future is … (For more on other aspects of framing an elevated deck, have a look at this guide.) Five basic components make up any deck: decking, joists (also known as a ledger when attached to a house), beams, posts, and footings. Proper deck board spacing should have a 1/8-inch gap after the decking has dried out. The deck joist span chart below is based on the updated codes from the International Residential Code (2015), which for the first time, specifically addressed these deck design considerations. Use the Beam and footing sizes table and find the 8' post spacing column. a Example: a=12’; Post Spacing=8’ y 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. However, it's important that the project is safe and structurally sound so you can enjoy your deck for years to come. Depending on the type of soil, the footing diameter at the base must be a minimum of 12", 10" or 9" for the corner post and 17", 14" or 12" for all intermediate posts. 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. Attempting a build on a 20' by 24' rectangle Flat deck, on a basically flat backyard, not attached to my home. I will attach 2 x 6 or 2 x 8 deck joists to these posts. See the Deck Post Size Table to make that determination because it will affect the size of beam you choose. According to the Deck Beam and Post Spacing chart, a 4-by-8 beam supporting a 12-foot joist span requires posts spaced no more than 7 feet apart, so we can use a 4-by-8 beam with three posts and footings spaced 6 feet apart for our 12-foot width. For decks with grip-type or side-mounted hidden fasteners for decking-to-joist connections and with any post height greater than 2.5 feet (measured from the top of the footing to the underside of the supporting beam), install 2x6 bracing to the underside of the deck joists per the requirements below. Deck Support Column Design . ... build the deck support columns using a poured footing with a concrete tube to just above ground level and use a wood post to continue to deck beam level or you can take the concrete tubes to the height of the deck beams as shown in Figure 2. Deck beam span table Deck joist span table Deck joist rule of thumb Deck & Porch Construction & Structural Fasteners Deck & Porch Post & Beam Connectors: steel post cap connectors, plywood post to beam cleats, other connectors Deck & Porch Railings, Code Requirements, Safety Deck framing tables, codes, specifications Questions & answers about allowable spans for deck, floor, or porch … or 2x12s at 24” O.C. I'm burying 4x4 posts in Concrete as I did with my large fence. Building a deck can create an outdoor oasis for entertaining and alfresco meals with family and friends. With a 12' deck span, the beam may be either two 2x8s or two 2x10s, depending on the wood used. If you install your decking using wet boards, pressure-treated decking that has not yet dried out, then you should install them with no gap as a gap will be created as they dry and shrink. The maximum joist spans below are based on a ground snow and live load of 40 pounds per square foot and a dead load of 10 pounds per square foot. Where it intersects with the deck joist span provides you with the maximum spacing between your posts. The anchor is hidden within the post unlike unsightly bulky exterior metal post brackets. Use the Beam Size table and find the 8’ post spacing column. Deck Board Spacing. Our load area is 6 x 12 = 72. Deck spacing … 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. It will affect the Size of beam you choose look at this guide. or two 2x10s, on... 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