It's a conundrum. The IRC is the authority and law, yet the work that many others, especially Lstiburek are far ahead of the code cycles. One of the first things that comes to mind is the attic ventilation methods that are widely adopted and accepted. They were established right after WWII and haven't hardly changed. Now Lstiburek and a host of other are pushing for condition, sealed, non-ventilated attics.