As a rule the larger the deck the larger the joists.
Floor decking span table.
It s better to build a deck that is strong than bouncy and unstable.
Steel post cap connectors plywood post to beam cleats other connectors deck porch railings code requirements safety deck framing tables codes specifications questions answers about allowable spans for deck floor or porch framing.
For example a 2 x 12 joist placed 16 oc.
Table 1 4 maximum joist spacing for decks southern pine deck joist maximum spans no cantilever with cantilever joists may cantilever up to of the actual adjacent span.
Again it s important to know your local codes.
If you use 5 4 decking joists must be no farther apart than 16 inches.
Allows for longer unshored span when metal deck is used as a leave in place form longer unshored span than non cellular profile for use when metal deck is used as a leave in place form 1 1 panel features and benefits 4 5d 12 4 5df 24 6d 12 6df 24 7 5d 12 7 5df 24 non composite deck 41 2 inch depth 12 inch coverage.
Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span.
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Dimensional lumber deck beam span chart.
Decking made of 2x4s or 2x6s can span up to 24 inches.
Spanning 16 6 between supports may cantilever up to an additional 4 1 for a total maximum length.
A double 2x12 beam can span 12 feet.
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.
Deck beam span table deck joist span table deck joist rule of thumb deck porch construction structural fasteners deck porch post beam connectors.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Don t be afraid to go to use a shorter span if you are unsure.
View joist rafter tables.
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.
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.
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Your selection of decking material will determine the maximum spacing of your joists.
The numbers in gray indicate the distance between the support posts.
To learn more about deck joist sizing spacing and allowable span reference this chart.
Decking boards span from joist to joist.
If you will run decking at an angle you might need to put the joists closer together.
Ready to start calculating how much lumber you ll need for your joists.
