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RE: Wind Calcs_ Interpolation of Cp Value at flat roof

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I would say "yes" for the interpolation between -0.9 and -1.3, but "no" to the use of the Reduction Factors.  Since the double asterisk is for only the h/L >= 1.0 value, I interpret that to mean that it only applies if you are at an h/L greater then 1.0.  Since you are between h/L of 0.5 and 1.0, I would say it does not apply.
Adrian, MI
-----Original Message-----
From: Joseph R. Grill [mailto:jrgrill(--nospam--at)]
Sent: Saturday, February 16, 2008 11:42 AM
To: seaint(--nospam--at)
Subject: Wind Calcs_ Interpolation of Cp Value at flat roof

I am looking within the table for Cp for the "All Heights" method (figure 6-6).  I have a structure with a flat roof and an h/L between .5 and 1.0.  For Cp values for horiz. dist. 0 to h/2 I'm pretty sure you can interpolate between -.9 and -1.3.  Tell me if I'm incorrect there, but also, can you use the "Reduction Factors" for the interpolated Cp?
Joe Grill