Span Tables Deck Floor Joist Span Chart

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.

Span tables deck floor joist span chart. Joist beam spans sizes. Framing tables for decks. The maximum joist spacing you can use will depend on the size and allowable span of your 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.

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. Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span. 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. As a rule the larger the deck the larger the joists.

Recommended or allowable joist beam spans. 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. Dimensional lumber deck beam span chart.

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. Ready to start calculating how much lumber you ll need for your joists. The numbers in gray indicate the distance between the support posts. To learn more about deck joist sizing spacing and allowable span reference this chart.

Deck joists are typically spaced either every 12 inches or 16 inches on center.