Trex was the first to invent the wood alternative decking category.
Trex decking span tables.
Some wood species are stronger than others so refer to the decking span table below before going to the deck joist span table.
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A 2 2x10 can span 10 feet and so on.
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When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches.
Single trex 1 5 8 joist maximum joist span ledger to box beam 15 0 cm 396 2 trex elevationstm span chart maximum cantilever length 4 0 121 9 50 psf total load 13 0 maximum cantilever length 4 0 maximum joist span ledger to box beam 16 joist spacing o c.
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.
Dimensional lumber deck beam span chart.
Most composite and pvc decking brands like trex and azek recommend a minimum joist spacing of 16 inches oc.
It s better to build a deck that is strong than bouncy and unstable.
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A double 2x12 beam can span 12 feet.
Cm cm 121 9cm table e 50 residential single trex 1 5 8 joist table.