Building code states that you need a continuous air barrier throughout the perimeter of the building envelope. It’s a great piece of code, as long as the architect and builder understand what is considered inside or outside the building envelope. As you see in this video, we see these interstitial spaces missed a lot. Unfortunately, usually I’m called in after the homeowner had been battling with unexplained musty odors that nobody could figure out.. then they end up needing to rip out all of th