Use our calculator above to determine the proper joist span for your deck based on the type of wood or materials used, joist size, and spacing. With this in mind, the joist span can range between 6 ft, 10 inches, to 18 ft. 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. Posi-Joist: Interactive Span Table: Try our interactive span checker to find the posi joist suitable for your project. The standard deck joist span can vary due to the size of your deck and the type of material used to construct it. It’s the strength and span that counts! What is the Standard Deck Joist Span? You can always stain a particular type of wood to match your aesthetic. Treated Hemlock or Pine may be a better solution. Check your local building codes for find out which species of wood are available in your market and - most importantly - check into the strength and spanning capabilities of a species.Įven if you like the look of Redwood, it may not be the strongest material available to you. There are also strength differences between Redwood, Fir, Pine, and other types of wood. Similarly, Southern Yellow Pine is less common on the West coast. For instance, California Redwood, Hemlock, or Douglas Fir are less common in the Southeast. Not every species of wood is widely available in every region. The location where you live plays an important role in choosing wood for your joists. All Inch inputs and dimensions are actual physical finished sizes (unless otherwise noted) ? Select output Fraction Precision, Decimal Inch or Metric mm. To learn more about deck joist sizing, spacing, and allowable span, reference this chart. Building Width Ridge Thick Actual: Rafter calculator ridge thickness adjustment diagram: Facebook LinkedIn Twitter WhatsApp Telegram eMail. 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. As a rule, the larger the deck, the larger the joists. If you just asked yourself “ do I need a permit to build a deck?” remember that the answer is almost always yes. As a critical part to a deck that will last you for years to come, it’s important to find out just how many joists you’ll need to safely support your decking - and that depends on the size of your deck and approved building permit plans
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