IBC 2015 Wind Load – Key Changes

An AAMA proposal (S173) clarifying that allowable stress design wind loads are to be used in the application of AAMA/WDMA/CSA 101/I.S.2/A440, DASMA 108 and ASTM E330.

An AAMA proposal (S295) that brings the 0.6 adjustment factor needed to go from ultimate design wind pressure to allowable stress wind pressure into Chapter 24 of the 2015 IBC. Chapter 24 specifically deals with glass. Although the provisions of the chapter have always been based upon allowable stress design, extension of the 0.6 adjustment factor into Chapter 24 was neglected when the changes to the design wind speed model occurred in the 2012 IBC.