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RE: Code Costs, Redux

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> -----Original Message-----
> From: Scott Maxwell [mailto:smaxwell(--nospam--at)] 
> Sent: Monday, June 04, 2007 7:53 AM
> To: seaint(--nospam--at)
> Subject: Re: Code Costs, Redux

> Keep in mind that the IRC is a prescriptive code.  It is not really
> "meant" for engineering use.  I believe that much of its use is
limited to
> low to moderate seismic use.  Thus, it is entirely possible that you
> "forced" into the IBC instead of the IRC in California anyways.

The IRC structural provisions can be used to design a house up through
Seismic Design Category D (which they divide into three subcategories:
D0, D1 and D2).  You're only automatically tossed into the IBC
structural provisions for Seismic Design Category E.

There are limits on irregularities (split-levels, cantilevers, offset
shear/braced walls) for Category C and for D0-D2 which will also kick
you out to the IBC for structural design.

It should be noted that the Building Seismic Safety Council has been
fairly effective on getting seismic detailing requirements from the
NEHRP provisions implemented in the IRC.


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

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