Beam Span Table

Beam Span Table

The span of a beam relies on just a few variables. The species of lumber, dimension of lumber and the load it carries.  Fewer posts on higher degree decks are sometimes extra fascinating to the occupants and this drives using bigger framing supplies for longer spans.   Beam span maximums are primarily based on a most anticipated reside load. Constructing codes for residential decks solely require 40 psf.

The longer the joist, the extra space of deck the joist helps, and thus the beam helps. For pressure-preservative-treated southern pine no. 2 grade, there’s a technique that can be utilized for estimating beam spans for a preliminary design. When supporting joists that span 12 toes with no overhang past the beam, a double ply beam can span in toes a worth equal to its depth in inches. A double 2×12 beam can span 12 toes; a (2) 2×10 can span 10 toes and so forth.

Joist Spans
 Species Dimension Beam 6′ Eight’ 10′ 12′ 14′ 16′ 18′
Southern Pine 2-2×6 6′-Eight”5′-Eight”5′-1″Four’-7″Four’-Three”Four’-Zero”Three’-9″
 2-2×8 Eight’-6″7′-Four”6′-6″5′-11″5′-6″5′-1″Four’-9″
 2-2×1211′-11″10′-Four” 9′-2″Eight’-Four”7′-9″7′-Three”6′-9″
 Three-2×6 7′-11″7′-2″6′-5″5′-10″5′-5″5′-Zero”Four’-9″
 Three-2X12 15′-Zero”13′-Zero”11′-7″10′-6″ 9′-9″9′-1″Eight’-7″
Douglas Fir-Larch,





Ponderosa Pine,

Purple Pine

 3X6 OR 2-2X6 5′-2″Four’-5″Three’-11″Three’-7″Three’-Three”2′-10″2′-6″
 3X8 OR 2-2X8 6′-7″5′-Eight”5′-1″Four’-7″Four’-Three”Three’-10″Three’-5″
 3X10 OR 2-2X10 Eight’-1″7′-Zero”6′-Three”5′-Eight”5′-Three”Four’-10″Four’-5″
 3X12 OR 2-2X12 9′-5″Eight’-2″7′-Three”6′-7″6′-1″5′-Eight” 5′-Four”
 4X6 6′-2″5′-Three”Four’-Eight”Four-Three”Three’-11″Three’-Eight”Three’-5″
 4X8 Eight’-2″7′-Zero”6′-Three”5′-Eight”5′-Three”Four’-11″Four’-7″
 4X109′-Eight”Eight’-Four”7′-5″6′-9″6′-Three”5′-10″ 5′-5″
 4X12 11′-2″9′-Eight”Eight’-7″7′-10″7′-Three”6′-9″6′-Four”
 Three-2X6 7′-1″6′-5″5′-9″5′-Three”Four’-10″Four’-6″Four’-Three”
 Three-2X8 9′-5″Eight’-Three”7′-Four”6′-Eight”6′-2″5′-9″5′-5″
 Three-2X10 11′-9″10′-2″9′-1″Eight’-Three”7′-7″7′-1″6′-Eight”
 Three-2X12 13′-Eight”11′-10″10′-6″9′-7″Eight’-10″Eight’-Three”7′-10″

Assumes 40 psf reside load, 10 psf lifeless load, L/360 easy span beam deflection restrict, cantilever size L/180 deflection restrict, No. 2 Stress grade, and moist service situations.

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