Wood Beam Span Tables For Decks

Numbers in blue are joist spans beam to beam or house to beam.

Wood beam span tables for decks.

Recommended or allowable joist beam spans. Joist beam spans sizes. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 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.

A double 2x12 beam can span 12 feet. 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. Framing tables for decks. 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.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. The numbers in gray indicate the distance between the support posts. A 2 2x10 can span 10 feet and so on. Sizing deck beams got a lot easier with the publication of the 2015 international residential code.

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.