While building airtightness is a key concern in Nearly Zero-Energy Buildings in most European climates, there exists already a wide range of commercially-available products specifically designed to minimise leakage in building envelopes. The objective of this webinar was to give information on the performance and properties of these products based on research including laboratory and field tests. The speakers also provided information on standards already published and under development on this subject. This webinar was organised in the framework of TightVent Europe (www.tightvent.eu), the building and ductwork airtightness platform which is facilitated by INIVE (www.inive.org).