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RE: l/600 or l/720 brick veneer light gage back-up

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Ken,
 
    I typically consider the "service" load to be the 10-year mean recurrence wind event.  This is typically considered 75% of the 50-year design wind.
 
 
bks
-----Original Message-----
From: Ken Peoples [mailto:kspeoples(--nospam--at)lvta.net]
Sent: Tuesday, December 07, 2004 7:26 AM
To: Seaint
Subject: l/600 or l/720 brick veneer light gage back-up

I know that BIA recommends l/600 to l/720 for a brick veneer back-up deflection limitation.  They say "for service loads".  What I am not sure about is what the design wind pressure for this condition should be.  Should this just be based on the same component and cladding design load used for the strength design of the studs or can it be a reduced wind load.  Table 1604.3 of IBC 2003 indicates that the deflection limit for exterior walls with brittle finishes should be l/240 and footnote f indicates that the load may be 0.7 times the design component and cladding loads.  This seems to be quite different form BIA's recommendation of l/600.  Perhaps a brick veneer is not considered a brittle finish?
 
Is the l/600 or l/720 specifically required somewhere else in the IBC?
 
Thanks for your help.
 
Best regards,
 
 
Ken
 
Kenneth S. Peoples, P. E.
LVTA
Lehigh Valley Technical Associates, Inc.
1584 Weaversville Road
Northampton, PA 18067
 
Phone: 610-262-6345
Fax:610-262-8188
Email: kpeoples(--nospam--at)lvta.net