The main result of the IgCC hearings today is that …
use of ASHRAE 189.1 in the 2012 IgCC will remain the same as it is in Public Verion 2 of the same document.
Basically, the jurisdiction that adopts the IgCC will have the right and responsibility to decide if ASHRAE 189.1 is to be used to demonstrate compliance with the IgCC. The designer or building owner will NOT have that option.