Floor Decking Span Table

Don t be afraid to go to use a shorter span if you are unsure.

Floor decking span table. To learn more about deck joist sizing spacing and allowable span reference this chart. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. For example a 2 x 12 joist placed 16 oc. Your selection of decking material will determine the maximum spacing of your joists.

It s better to build a deck that is strong than bouncy and unstable. If you use 5 4 decking joists must be no farther apart than 16 inches. Decking made of 2x4s or 2x6s can span up to 24 inches. The numbers in gray indicate the distance between the support posts.

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. If you will run decking at an angle you might need to put the joists closer together. A double 2x12 beam can span 12 feet. Keep up on our always evolving product features and technology.

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. Some wood species are stronger than others so refer to the decking span table below before going to the deck joist span table. Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span. 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.

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. Again it s important to know your local codes. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. As a rule the larger the deck the larger the joists.

Spanning 16 6 between supports may cantilever up to an additional 4 1 for a total maximum length. Enter your information below and subscribe to our newsletter. Ready to start calculating how much lumber you ll need for your joists. Decking boards span from joist to joist.

Deck beam span table deck joist span table deck joist rule of thumb deck porch construction structural fasteners deck porch post beam connectors. 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. Dimensional lumber deck beam span chart.