We do this by: Advising on how to design and build airtight buildings so that air infiltration is controlled rather than unplanned air-leakage which affects comfort, air-quality, and requires greater consumption of energy to maintain desired air temperature due to loss of conditioned air.
Performing a verification test of the building envelope performance. i.e. a quantifiable figure to measure against best practice.
When the air-leakage is greater than planned, we can identify air-leakage locations so that remedial action can be taken