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Re: Tornado Alley construction

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Point taken.  I wonder if companies like Simpson "or equal"  :-)  have presentations in such areas...   It's baffling...

On Fri, Jun 6, 2008 at 1:19 PM, Dave Adams <davea(--nospam--at)> wrote:



The use of the IRC is limited to regions not exceeding 110 mph … anything beyond that you have to use the IBC.  However, a general lack of enforcement & inspection in many regions of the U.S. happens irrespective of the code being used.  The IRC is a good starting point because there are many regions where it works quite well.  Besides that, the IRC specifically states that if roof elements experience an uplift pressure of 20psf or greater (using the "components and cladding" table provided in Chapter 3), the designer MUST provide straps, etc. to complete an uplift load path to the foundation (an "engineered condition", which may be mixed with an otherwise "prescriptive" residence).  The State of Florida also adopted it as a model document for residential design and added their own modifications as they needed.  Been that way for a long time.




Dave K. Adams, S.E., P.Eng.

Lane Engineers, Inc.

Tulare, CA






From: David Topete [mailto:d.topete73(--nospam--at)]
Sent: Friday, June 06, 2008 12:00 PM
Subject: Tornado Alley construction



It's amazing what uplift straps and sill bolts can do to prevent a house from flying away...  Granted, I'm out here in eqk country so tornadoes (or hurricanes) are not readily designed for.  But, with all the damage from tornadoes each year, especially through "Tornado Alley," wouldn't most building departments want to scrap the IRC and its prescriptive methods (if that is the code in effect) in favor of anchor bolts and roof straps??? 

David Topete, SE

David Topete, SE