LAUSR

Abstract The French air leakage testers' scheme led to the development of a national database, which includes about 219,000 airtightness measurements, mainly from residential buildings built since 2010. This paper first presents the measurement methodology and the requirements of the testers’ scheme regarding the reliability of the data included in the database. Different analyses are then presented, to: - give a general overview of the new French building stock; - analyse several factors, including insulation, ventilation systems, and main building materials, that may significantly impact building leakage measurement results; - identifying levers to improve the practices of building construction stakeholders and testers. These analyses reveal influential factors, such as the main material of the building, the thermal insulation technique and the type of ventilation system. The most frequently identified leaks and the most influential leaks have been identified, in order to improve building airtightness. The common use of last-minute correction has also been identified, despite the impact on airtightness durability. Finally, these analyses confirm that the multi-point testing method fits well with the French context, buildings and climates.