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IBC Deflection Limits for Brick Cladding

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The 2012 International Building Code (IBC), Table 1604.3 provides a 
deflection limit of L/240 for "other brittle finishes" with the wind 
pressure taken as 0.42 times the “component and cladding” pressures for 
 determining deflection limits.  I have presumed this to apply to brick 
veneer / stud wall systems.

The basis of this provision is not provided in the IBC.  In the past a 10 
year wind was roughly equivalent to about 0.75 times the 50 year wind.

Does anyone know the basis for either the L/240 or the 0.42 factor?

Regards, Harold Sprague

> Date: Tue, 2 Oct 2012 09:36:03 -0700
> From: r_varjavand(--nospam--at)
> Subject: [SEAINT-SEAOSC] Site Amplification in Japanese Codes
> To: seaint-seaosc(--nospam--at)
> Good morning,
> I would really appreciate it if you could share with me your information
> about site amplification coefficients in Japanese building codes.
> Any link to the code , or a document that mentions those coefficients 
> would help me much.
> Sincerely,
> Roshanak
> ________________________________
> From: Will Haynes <gtg740p(--nospam--at)>
> To: seaint-seaosc(--nospam--at)
> Sent: Monday, October 1, 2012 2:42 PM

Truncated 1393 characters in the previous message to save energy.

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