Floor Decking Span Table

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Floor decking span table.

If you will run decking at an angle you might need to put the joists closer together. 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. Some wood species are stronger than others so refer to the decking span table below before going to the deck joist span table. Dimensional lumber deck beam span chart.

As a rule the larger the deck the larger the joists. Enter your information below and subscribe to our newsletter. Ready to start calculating how much lumber you ll need for your joists. 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 use 5 4 decking joists must be no farther apart than 16 inches. View joist rafter tables. A 2 2x10 can span 10 feet and so on. 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.

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. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Don t be afraid to go to use a shorter span if you are unsure. The numbers in gray indicate the distance between the support posts.

For example a 2 x 12 joist placed 16 oc. To learn more about deck joist sizing spacing and allowable span reference this chart. Again it s important to know your local codes. Spanning 16 6 between supports may cantilever up to an additional 4 1 for a total maximum length.

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. 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. Deck beam span table deck joist span table deck joist rule of thumb deck porch construction structural fasteners deck porch post beam connectors. Keep up on our always evolving product features and technology.

Decking boards span from joist to joist. Decking made of 2x4s or 2x6s can span up to 24 inches. A double 2x12 beam can span 12 feet.