While almost a complete gut renovation, the design was able to incorporate the installation of a continuous air barrier and the necessary insulation while working around the home's existing staircase. (nypassivehouse.org)
Air barrier systems are typically the most common approach, however, air pressure control approaches are becoming more common especially in cases involving remedial work on existing structures. (buildingscience.com)
However, other changes have also occurred over this time, specifically the use of air barriers, and steadily increasing insulation requirements. (buildingscience.com)