Floor Decking Span Table

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.

Floor decking span table.

Don t be afraid to go to use a shorter span if you are unsure. 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. Again it s important to know your local codes.

View joist rafter tables. 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. If you will run decking at an angle you might need to put the joists closer together. Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span.

Spanning 16 6 between supports may cantilever up to an additional 4 1 for a total maximum length. Keep up on our always evolving product features and technology. As a rule the larger the deck the larger the joists. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

Enter your information below and subscribe to our newsletter. To learn more about deck joist sizing spacing and allowable span reference this chart. Ready to start calculating how much lumber you ll need for your joists. 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.

Decking made of 2x4s or 2x6s can span up to 24 inches. If you use 5 4 decking joists must be no farther apart than 16 inches. The numbers in gray indicate the distance between the support posts. For example a 2 x 12 joist placed 16 oc.

It s better to build a deck that is strong than bouncy and unstable. Your selection of decking material will determine the maximum spacing of your joists. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. 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.

Some wood species are stronger than others so refer to the decking span table below before going to the deck joist span table. Deck beam span table deck joist span table deck joist rule of thumb deck porch construction structural fasteners deck porch post beam connectors. Decking boards span from joist to joist.