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RE: wind pressures

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Title: wind pressures



Can you provide some more details on the topography and siting of the house? While I’m not an expert on topographic effects by any stretch of the imagination, something seems way off. I have access to some unpublished tables of Kzt factors (work in progress for the next edition of AF&PA’s WFCM). The maximum Kzt for a 2D-ridge is 1.77--for a 25% upper half of slope, 1000-foot high ridge, and the house right at the crest.



Gary J. Ehrlich, PE
Program Manager, Structural Codes & Standards
National Association of Home Builders (NAHB)
1201 15th Street, NW, Washington, DC 20005
ph: 202-266-8545  or 800-368-5242 x8545
fax: 202-266-8369

Attend the 2010 International Builders' Show
January 19-22, 2010, Las Vegas, NV


From: Gordon Goodell [mailto:GordonGoodell(--nospam--at)]
Sent: Thursday, August 20, 2009 12:56 PM
To: seaint(--nospam--at)
Subject: wind pressures



I’m working on a house just below the crest of a very big ridge (2D)...a very windy site in a not unusually windy location.  Accounting for topographic effects, I get Kzt = 2.83, almost tripling my wind pressures.  End zone wall pressure for MWFRS is 38psf!  Just for comparison, what kind of pressures do those of you in hurricane country deal with?


Gordon Goodell

Alta, WY