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RE: Wind Exposure

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I see what you are saying. Unfortunately there are a number of agencies in my area that won’t allow such a justification without surveys of buildings, etc. It is more expensive, sometimes, to justify it than to just bite the bullet.


Mark E. Deardorff, Structural Engineer

Burkett & Wong

San Diego, CA

From: S. Gordin [mailto:mailbox(--nospam--at)]
Sent: Monday, January 09, 2006 1:49 PM
To: Seaint@Seaint. Org
Subject: Re: Wind Exposure




Check CBC 1619 and 1619A, Exposure B is definitely allowed, even for OSHPD projects.  I used it many time. 




The subject case could have been Exposure B, except for the fact that Exposure B (and C) definition clearly refers to "terrain" as opposed to "terrain facing large bodies of water" of Exposure D definition.  Therefore, in the subject case, Exposure D is more in line with the apparent intent of the code.


Steve Gordin SE
Irvine CA


----- Original Message -----

Sent: Monday, January 09, 2006 1:25 PM

Subject: RE: Wind Exposure


The State of California B/C does not allow the use of Exposure B under any conditions. You can use C or D however. If you’re not in CA check with your B/D.


From: Ed Tornberg [mailto:ed(--nospam--at)]
Sent: Monday, January 09, 2006 12:33 PM
To: seaint(--nospam--at)
Subject: Wind Exposure


Let’s say I have a house that’s 600 feet or so from the ocean, West coast.  ASCE 7-02 governs.


Between the waterline and the house is a hill, evergreen trees, and other houses.  It’s clearly surface roughness B all around.


Question1 :  What is the design wind exposure?


Question 2:  would it make any difference if using the 1997 UBC?




Ed Tornberg

Tornberg Consulting, LLC