Wood Beam Span Tables For Decks

The numbers in gray indicate the distance between the support posts.

Wood beam span tables for decks.

Recommended or allowable joist beam spans. Framing tables for decks. Sizing deck beams got a lot easier with the publication of the 2015 international residential code. 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.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Numbers in blue are joist spans beam to beam or house to beam. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. A double 2x12 beam can span 12 feet.

Joist beam spans sizes. 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. 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. 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.

A 2 2x10 can span 10 feet and so on.