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U.S. building code requires support posts for the rail structure to be no further apart than 6 feet on a deck with 4ร4' deck rail posts and no more than 8 feet apart for decks with 6ร6' deck rail posts. Posts should be no further apart than 5.5 feet on stairs.
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The distance between deck support posts depends on the type of wood species used and the size of the joist and beam. There is no minimum span, and maximum spans can reach up to 15'. Below we'll take a look at some of the main considerations when asking how far apart should deck posts be.
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Some decking materials installed at a 45-degree angle to the run of the joists require the joist spacing to be 12 inches on center. Your joist span will depend on the size of the joists (i.e. 2X8 vs 2x10 vs 2X12). See the below span chart as well as the local codes and guidelines for your jurisdiction. The larger the span, the larger the joists.
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In general, deck posts should be spaced no more than 6 feet apart. Beyond that amount, it becomes very difficult to meet the safety requirements.
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Updated February 28, 2023 By Marc McCollough A safe, long-lasting deck frame needs proper footings, support posts and a solid construction. We'll show you how to build a deck frame. See the complete deck project from design to finishing touches at Lowes.com/BuildaDeck. Table of Contents Pouring the Post Footers Shop Your Deck Framing Project
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A deck beam is a board or collection of boards that support the deck joists and decking. Beams are made out of a variety of treated dimensional lumber. They may be a single plank, or consist of two, three, or even four 2x8s, 2x10s, or 2ร12 boards fastened together with bolts or nails.
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For example, a secluded patio might have closer post spacing than one intended for entertaining. Here are some standard post spacings for different types of patios: Secluded patios: 6-8 feet apart. Casual patios: 8-10 feet apart. Formal patios: 10-12 feet apart. Keep in mind that these are just general guidelines.
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Step 4: Square Up the Batter Boards and Connect Them with Mason Line. With a helper, apply the 3-4-5 method-or the identical 6-8-10 method-to square the line to the house. Start by measuring along the house and mark 8 ft. On the mason line, mark 6 ft. Then measure the diagonal distance from endpoint to endpoint.
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The maximum distance between deck posts is about 15 feet, and posts require thicker wood the longer the span. The International Residential Code requires deck railings for any deck that is more than 30 inches above the ground. Most builders rely on 4-inch by 4-inch wood for good, solid railing material.
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Plug these values into the formula: DPS = (L - W) / (N + 1). Calculate the result, which will be the ideal distance between your deck posts. Let's illustrate this with an example. Example Suppose you're building a deck with a length ( L) of 16 feet, a width ( W) of 10 feet, and you plan to install 4 deck posts ( N ). Using the formula:
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The standard rule for footings is that for a basic deck, the larger the beam and footing size, the fewer footings you'll need. If you're building a simple deck, footings and posts should be placed 8 feet apart on average. However, if your deck will include a hot tub or roof, you must support that weight with additional footings spaced more closely.
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4X4 (4 feet by 4 inches) 6X6 (6 feet by 6 inches) 8X8 (8 feet by 8 inches) These posts have been calculated and designed to these standard sizes so that they will appropriately handle the expected load of the deck. Moreover, the most common post types are that of 4X4 and 6X6. This is even true when considering large decks of 250sqft.
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The maximum distance between deck posts is around 15 feet, with the posts requiring that you need to have thicker wood the longer the span is. Most decks with longer spans are built on uneven ground, requiring that posts be spaced unevenly to ensure that the deck stays level.
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The design tables for deck-post height included in both the 2015 and 2018 editions of the IRC were indeed limiting, as Table R507.8 was a one-size-fits-all prescription, with the maximum heights of 4x4 to 6x6 posts based on the greatest possible area of deck that could be generated with IRC joist-span and deck-beam design tables.
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The standard deck joist span can vary due to the size of your deck and the type of material used to construct it. Depending on the size of the deck itself, whether your joists are spaced either 12 inches or 16 inches from the center, and the framing materials and size of deck boards used, deck joist spans may vary.
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Updated January 28, 2020 This is the second guide in a three-part series on how to build an attached deck. The last guide gave an overview of the planning and design process. Now we'll get into installing the 4ร4 posts and framework, including the ledger board, beams and rim joists.