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Re: ASCE 07-2005 Unbalanced Snow

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Title: Re: ASCE 07-2005 Unbalanced Snow

Here's a link to an article co-authored by Professor O'Rourke that deals with this subject, primarily as it impacts low-rise wood frame structures:

There is some discussion of the background and several examples and tables. This paper will appear in the December issue of Structure Magazine.

There was also a paper that appeared in the August 2006 issue of Frame Building News called Review of ASCE 7-05 unbalanced snow

load provisions and their effect on building design. I was able to view it online as a subscriber and subscribing is free:



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: "jvhannah" <jvhannah(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Re: ASCE 07-2005 Unbalanced Snow

Any research on the unbalanced snow load provisions should start with = Michael O'Rourke and Peter D Wrenn authors of "Snow Loads: A Guide to = the use and Understanding of the Snow Load Provisions of ASCE 7-02" = (ISBN 0-7844-0725-9) and many papers on snow loads including several in = the ASCE Journal of Structural Engineering (Exact title???). There are = Two (2) pages of referenced papers in the above book, not all of them = are on unbalanced snow loads but some are useful. I don't know if or = when a new edition of Snow Loads will be coming out for ASCE 7-05.

Jim Hannah

----- Original Message -----=20
From: Jake Watson=20
Sent: Monday, November 27, 2006 9:39 AM
Subject: ASCE 07-2005 Unbalanced Snow

ASCE 07 has changed the unbalanced snow load requirements yet again. = The snow load profile places the maximum unbalanced load at the ridge. = As someone who has spent a fair amount of time in snow country, I don't = think I have ever seen that load pattern. The commentary indicates = there are "studies" available to document this pattern but doesn't cite = "" references. Does anyone know those references or studies?=20

Jake Watson, P.E.
Salt Lake City, UT