Chapter 12:               Air Leakage Diagnostics

This chapter focuses on pressure-testing homes, to determine their airtightness and to guide air-sealing during weatheriza­tion. Ideally the air barrier and insulation are installed together at the building’s thermal boundary. The airtightness of the air barrier has a substantial effect on the performance of the insula­tion. The testing described here helps to analyze the existing air barriers and decide whether and where air-sealing is needed.