IBC 2007 Wind calcs.

After 40 yrs. of doing UBC calcs. I am attempting to do my first IBC calcs. and need help, even after attending a seminar, which seemed to cover lots of things but not this.

For a simple house, using 6.4 Method 1 Simplified Procedure, I cannot get a reasonable wind pressure of something between 15 psf and 25 psf.

From 6.4.2.1, I get p s= 1.0 (1.0) 1.0 (2.3) = 2.3 psf which is unrealistic. This is using Fig. 6-2, exposure B, h=30 ft., Kzt =1
and I=1

Can someone point out my omissions/errors?

Stan Scholl, P.E.
Laguna Beach, CA
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