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RE: 85mph overhang pressures

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Yeah, that’s basically the conclusion I came to as well.  Still, I am curious why 85mph is not included.


Thanks to everyone for their input.


Doug Mayer, SE

Structural Engineer





7535 North Palm Ave., Suite 201

Fresno, CA 93711


(559) 437-0887 Ph.

(559) 438-7554 Fax



From: Andrew Kester, P.E. [mailto:akester(--nospam--at)]
Sent: Thursday, May 01, 2008 10:45 AM
To: seaint
Subject: 85mph overhang pressures




As someone else said, pressure is a function of V^2.


So if my math is correct, the difference between 85mph and 90mph:


(90)^2-(85)^2   x 100% = 12%



Now a 12% increase in overhang uplift in my opinion affects nothing. So you end up MAYBE with a slightly larger uplift strap. Great, that is the weakest point of the structure and money well spent. Since straps are less than a buck anyway for the most part. I have seen lots of roof and structural failures that started with the uplift strap.


I would use 90mph and rock on.



Andrew Kester, P.E.
Principal/Project Manager
ADK Structural Engineering, PLLC
1510 E. Colonial Ave., Suite 301
Orlando, FL 32803

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