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Spans

 


WWPA is the leading source of technical information on Western lumber spans and offers a variety of design aids to assist professional users. One of the more popular sources of span information is the Association's Western Lumber Span Tables book, which is available here in a digital format.

Individual tables published in Western Lumber Span Tables (572) can be viewed on this page using Adobe Acrobat. Download the entire book at the WWPA Store.

Western Lumber Span Tables book (PDF file)

Download full book ($15.00)


Individual Tables
(PDF files)

To select an individual table, click on a pattern group below.

Floor Joists

 

30#Live 10#Dead
30#Live 25#Dead
40#Live 10#Dead
40#Live 20#Dead
40#Live 25#Dead
50#Live 10#Dead
50#Live 20#Dead
50#Live 25#Dead

60#Live 10#Dead
60#Live 20#Dead
60#Live 25#Dead
75#Live 10#Dead
75#Live 20#Dead
75#Live 25#Dead
80#Live 10#Dead

80#Live 20#Dead
80#Live 25#Dead
100#Live 10#Dead
100#Live 20#Dead
100#Live 25#Dead
125#Live 10#Dead
125#Live 20#Dead


Ceiling Joists

20#Live 10#Dead L/360
20#Live 10#Dead L/240

10#Live 10#Dead L/360

10#Live 5#Dead L/240


Roof Rafters L/180

20#Live 15#Dead
25#Snow 10#Dead
20#Snow 7#Dead
25#Snow 7#Dead
30#Snow 7#Dead
40#Snow 7#Dead

60#Snow 7#Dead
80#Snow 7#Dead
100#Snow 7#Dead
20#Snow 15#Dead
25#Snow 15#Dead
30#Snow 15#Dead

40#Snow 15#Dead
60#Snow 15#Dead
80#Snow 15#Dead
100#Snow 15#Dead


Roof Rafters L/240

20#Live 10#Dead
20#Live 15#Dead
20#Live 25#Dead
20#Snow 10#Dead
25#Snow 10#Dead
30#Snow 10#Dead
40#Snow 10#Dead
60#Snow 10#Dead

20#Snow 15#Dead
25#Snow 15#Dead
30#Snow 15#Dead
40#Snow 15#Dead
60#Snow 15#Dead
80#Snow 15#Dead
100#Snow 15#Dead

20#Snow 25#Dead
25#Snow 25#Dead
30#Snow 25#Dead
40#Snow 25#Dead
60#Snow 25#Dead
80#Snow 25#Dead
100#Snow 25#Dead


Roof Rafters L/360

20#Live 15#Dead
20#Live 30#Dead
20#Snow 15#Dead
25#Snow 15#Dead
30#Snow 15#Dead
40#Snow 15#Dead

60#Snow 15#Dead
80#Snow 15#Dead
100# Snow 15#Dead
20#Snow 30#Dead
25#Snow 30#Dead

30#Snow 30#Dead
40#Snow 30#Dead
60#Snow 30#Dead
80#Snow 30#Dead
100#Snow 30#Dead


For spans for built-up members, see WWPA Tech Note Design Load Tables for Solid-Sawn Lumber Beams and Headers in the Tech Notes section.

Span information for U.S. and Canadian Douglas Fir-Larch and Douglas Fir (North) combination are detailed in the Tech Note Design Values for U.S. and Canadian Species Group Combinations,Tech Notes section. which can be found in the

WWPA also offers a number of other publications and design tools that can be used to determine spans for Western lumber products. These include:

  • WWPA Span Computer (SR), a manual slide rule for calculating Western lumber spans.

  • Western Woods Use Book (WWUB), which includes engineering information for Western products.

To order these publications or design tools, go to the WWPA Online Literature Store.


While every effort has been made to ensure the accuracy of the Western lumber information included in this Online Technical Guide, WWPA accepts no responsibility for errors or omissions in the information presented herein, or for errors which may occur in downloading and printing any of the files, nor any liability resulting from the use of this information for design and construction applications.

The WWPA Online Technical Guide is copyrighted by Western Wood Products Association in Portland, Oregon. ©

 
 
 
    

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