14.06.301.2.1.3 Wind speed conversion.

Section R301.2.1.3 (Wind Speed Conversion) of the IRC shall be replaced with the following:

Basic Wind Speed. The basic wind speed for determining designed wind pressure shall be 135 miles per hour, 3 second gust.

Prescriptive - Vult = 135 MPH, exposure B

Engineered Design (IRC & IBC Chapter 16):

Unless proven to be outside of special wind regions per the currently adopted ASCE, any structural elements designed outside of IRC prescriptive requirements are required to be designed using:

IBC ultimate design criteria for wind loading. (Vult = 135 MPH, 3 second gust for Risk Category II or Risk Category as applicable) See commercial structural design information for additional IBC requirements.

Vasd = Vult √(0.6)

(Sec. 4 (Exh. C) of Ord. 2004-06-04; amended by Sec. 16 of Ord. 2007-06-19; amended by Sec. 19 of Ord. 2025-10-01)