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However lumber prices are rising and therefore it is more common to see 5 4 x6 deck boards that should not span more that 16 and usually 12.
Deck joist spacing. Make sure all. Most decking is not strong enough to support longer spans than 16. But you ll notice when you look at the portion of the span table for joists with cantilevers that the joist span for decks with a cantilever is often less than the span for the same sized joist without cantilevers. 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.
Most composite and pvc decking brands like trex and azek recommend a minimum joist spacing of 16 inches oc. To learn more about deck joist sizing spacing and allowable span reference this chart. Before installing any decking run string line. Deck joist spacing blocking guide step 1.
Joist spacing for composite decking. How far apart should deck joists be spaced. Deck joists are typically spaced either every 12 inches or 16 inches on center. 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.
Check that your deck frame is structurally sound. The layout term for joists is on center which is the center to center measurement from one joist to the next. Run string lines to ensure all joists are level in plane. 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.
Some builders reduce joist spacing to 12 on center to strengthen the deck frame or to increase maximum allowable joist spans. Deck joists have a different maximum span length depending upon the size spacing and framing material that you re creating your deck with. The maximum joist spacing you can use will depend on the size and allowable span of your joists. Before you begin make sure you re familiar with the different.
As a rule the larger the deck the larger the joists. Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span. Most decks use 16 on center spacing for joists. Some brands like weardeck let you get away with more reinforced with a layer of fiberglass on both the top and bottom weardeck boards easily allow for spans of 24 inches oc.
Ready to start calculating how much lumber you ll need for your joists.
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