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about load duration factor

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Here are a few links that should help:

If you are interested in simple rafter or floor joist design, see the
online span calculator here:

Hope this information helps.


John "Buddy" Showalter, P.E. 
Director, Technical Media 
AF&PA/American Wood Council 
1111 19th Street, NW, Suite 800 
Washington, DC 20036 
P: 202-463-2769 
F: 202-463-2791 

The American Wood Council (AWC) is the wood products division of the
American Forest & Paper Association (AF&PA). AWC develops
internationally recognized standards for wood design and construction.
Its efforts with building codes and standards, engineering and research,
and technology transfer ensure proper application for engineered and
traditional wood products.

The guidance provided herein is not a formal interpretation of any AF&PA
standard.  Interpretations of AF&PA standards are only available through
a formal process outlined in AF&PA's standards development procedures.


From: marcia mendez <mendezsole01(--nospam--at)>
Subject: about load duration factor
To: seaint(--nospam--at)

Hello, I am just starting in structural design.
I ask for load duration factor.
Enercalc 6.0 has the load combination tab. What I have to do if I want
use the load duration factor (1.25) designing a roof rafter i.e? Or if I
need to design a floor joist where the load duration factor doesn't
Thanks for your valuable information

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