Floor Joist Spans Wood Deck

If you will run decking at an angle you might need to put the joists closer together.

Floor joist spans wood deck.

View joist rafter tables. 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. 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. Joist beam spans sizes.

Decking made of 2x4s or 2x6s can span up to 24 inches. Steel joists such as trex elevations are machine made making each joist an identical twin. For best results refer to our wood and composite deck joist span table. Decking boards span from joist to joist.

Steel joists offer a stronger straighter and potentially safer alternative to wood. Even when using the strongest wood to build joists for a deck that wood is still subject to the elements and can bend bow or warp with time. 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. Again it s important to know your local codes.

Recommended or allowable joist beam spans. Floor joist span tables for various sizes and species of wood. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. The spans of joists varies based upon several factors.

If you use 5 4 decking joists must be no farther apart than 16 inches. 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. Here s a helpful chart covering the most popular wood framing species and their maximum allowed spans.

Joist size spacing between joists decking material and wood species. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. 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. 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.

Framing tables for decks.