Floor Joist Spans Wood Deck

Joist beam spans sizes.

Floor joist spans wood deck.

For best results refer to our wood and composite deck joist span table. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Steel joists such as trex elevations are machine made making each joist an identical twin.

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. 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. Here s a helpful chart covering the most popular wood framing species and their maximum allowed spans.

Again it s important to know your local codes. Deck joists have a different maximum span length depending upon the size spacing and framing material that you re creating your deck with. 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 spans of joists varies based upon several factors.

If you use 5 4 decking joists must be no farther apart than 16 inches. Framing tables for decks. 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.

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. Steel joists offer a stronger straighter and potentially safer alternative to wood. The larger the deck the larger the joists. Joist size spacing between joists decking material and wood species.

Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span. Decking made of 2x4s or 2x6s can span up to 24 inches. 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. Floor joist span tables for various sizes and species of wood.

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.