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. Multiply the span given by the multiplier for the wind zone (low and medium 1.3) or (high and very high 1.1) to calculate the extended span for the wind zone chosen. 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. Choose the rafter size and the spacing intended and read off the permitted span. 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. (the tables permit a bearing length of up to 3.5 inches, but since 1.5 is probably the worst case that you’ll encounter for joist or rafter bearing, it’s a safe value.) You can get. For instance, California Redwood, Hemlock, or Douglas Fir are less common in the Southeast. Table 9.1 in Span Tables for Joists and Rafters (Figure 5) gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1.5 inches. Joists with a Max. Centres Flooring thickness must be checked before installation to ensure it can span the intended Max. Not every species of wood is widely available in every region. Joist Centres are 300mm, and they can only be used at any joist centres equal to or less than 300mm centres. The greater of space between rafters, the shorter the distance i can span. The location where you live plays an important role in choosing wood for your joists. Rafter joist spacing the one one aspect of roof design and building that affects the span, down with load variables, wood species, and grade. To learn more about deck joist sizing, spacing, and allowable span, reference this chart. 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. This will feature 140 Wood Knowledge Sheets, providing members of TDUK with an essential library of information. 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 The span tables are a first taste of TDUK’s forthcoming Knowledge Library, which will be published over the next few months.
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