airtightness of building envelope

The performance of ventilation and airtightness of the building envelope was studied in field measurements in recently constructed Estonian apartment buildings. The buildings were selected with different building envelopes and ventilation systems. The mean air leakage rate at the pressure difference of 50 Pa in the database was 1.7 m3/(h·m2). The mean air change rate at the pressure difference of 50 Pa from the database was 2.3 h-1.