Floor Joist Spans Wood Deck

Steel joists such as trex elevations are machine made making each joist an identical twin.

Floor joist spans wood deck. 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. 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. If you will run decking at an angle you might need to put the joists closer together. Again it s important to know your local codes.

Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span. Here s a helpful chart covering the most popular wood framing species and their maximum allowed spans. The spans of joists varies based upon several factors. The larger the deck the larger the joists.

Framing tables for decks. Steel joists offer a stronger straighter and potentially safer alternative to wood. This article explains typical spans for deck joists deck beams and deck flooring giving both standard span tables and a quick rule of thumb that works pretty well. 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.

Deck joists have a different maximum span length depending upon the size spacing and framing material that you re creating your deck with. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Recommended or allowable joist beam spans. 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.

View joist rafter tables. 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. Decking boards span from joist to joist. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Joist beam spans sizes. 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. 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. Floor joist span tables for various sizes and species of wood.

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