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.
Wood beam span 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.
Sizing deck beams got a lot easier with the publication of the 2015 international residential code.
Joist beam spans sizes.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
A double 2x12 beam can span 12 feet.
Dimensional lumber deck beam span chart.
Deck builders can now refer to section r507 6 deck beams and table r507 6 deck beam span lengths to determine the size of 2 ply and 3 ply built up beams made from 2 6 through 2 12 lumber.
Numbers in blue are joist spans beam to beam or house to beam.
Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span.
Framing tables for decks.
Floor joist span tables for various sizes and species of wood.
The numbers in gray indicate the distance between the support posts.