Deck Floor Joist Span Table

For best results refer to our wood and composite deck joist span table.

Deck floor joist span table. Joist size spacing between joists decking material and wood species. In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above. 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. Joist beam spans sizes.

Framing tables for decks. Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span. Recommended or allowable joist beam spans. The larger the deck the larger the joists.

Plus unlike floor joists decks needs to be able to support the extra weight of pressure treated wood handrails as well as snowfall during winter. The distance you choose affects the maximum span or how long your joists can be without compromising the strength of the deck frame. The smaller the spacing the longer your joists can span. 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.

If you will run decking at an angle you might need to put the joists closer together. Your composite decking manufacturer will have a unique joist span table to help you determine the maximum length based on joist size and spacing. Floor joist span tables for various sizes and species of wood. View joist rafter tables.

Decking boards span from joist to joist. If you use 5 4 decking joists must be no farther apart than 16 inches. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Again it s important to know your local codes.

The proper deck joist span distance between supporting beams below the joists for your deck should be known before you start building and is needed to draft your deck plan. The deck joist span chart below is based on the updated codes from the international residential code 2015 which for the first time specifically addressed these deck design considerations. The spans of joists varies based upon several factors. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

To learn more about deck joist sizing spacing and allowable span reference this chart.