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Decking made of 2x4s or 2x6s can span up to 24 inches.
Deck joist spacing for 5 4 decking. Total deck joist span including cantilever less than or equal to 2 2 x 6 6 8 10 12 14 16 18 6 11 5 11 5 4 4 10 4 6 4 3 4 2 2 x 8 8 9 7 7 6 9 6 2 5 9 5 4 5 2 2 x 10 10 4 9 8 7 4 6 9 6 4 6. But the 2015 irc included a new one table r507 5 that will make it easy for deck builders to spec a joist size for a given span and joist spacing. Again it s important to know your local codes. 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.
If adding additional framing be sure to keep all boards level and in plane across the tops. If you use 5 4 decking joists must be no farther apart than 16 inches. For a more rigid feel 12 or less may be preferred. The table includes spans for.
If you will run decking at an angle you might need to put the joists closer together. Joist size spacing between joists decking material and wood species. Decks get wet and may be framed with incised treated lumber so spans may have to be adjusted. Some builders reduce joist spacing to 12 on center to strengthen the deck frame or to increase maximum allowable joist spans.
The proper deck joist span distance between supporting beams below the joists for your deck should be known before you start building and is needed to draft your deck plan. Most decking is not strong enough to support longer spans than 16. 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. Make sure your joists are spaced correctly deck joist spacing should never exceed 16 on center with the exception of max deck boards which allow for maximum 24 on center.
The layout term for joists is on center which is the center to center measurement from one joist to the next. Decking boards span from joist to joist. On center for standard straight composite decking installation. Joist spacing for composite decking.
Most decks use 16 on center spacing for joists. Until a few years ago the irc didn t have deck joist span tables. Most composite and pvc decking brands like trex and azek recommend a minimum joist spacing of 16 inches oc. The spans of joists varies based upon several factors.
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