Durability of building airtightness - on-site and laboratory studies

DESCRIPTION OF THE SESSION

Air leakages have an increasing impact on the overall energy performance of new buildings. Therefore, since the early 2000’s, regulations in many countries explicitly account for airtightness, sometimes with mandatory requirements, as a consequence of Europe’s ambition to generalize nearly zero energy buildings by 2030. However, having a requirement on building airtightness is relevant only if the airtightness level is durable. Nevertheless, studies have shown that a mandatory level of airtightness leads to last-minute taping and mastic setting that is most probably not durable.

The durability of airtightness products and assemblies at mid- and long-term scales is, therefore, a pending question. Indeed, this subject remains very complex, since it covers in the meantime:

  • the modelling of the mechanisms of buildings’ and products’ loads and deformations,
  • the accelerated ageing in laboratory-controlled conditions and,
  • the performance characterization from field measurements results.

In the past years, several studies have focused on this issue using two different approaches. Some studies seek to characterize the evolution over time of the airtightness by field measurements in real buildings. The other studies are based on laboratory measurements in order to test the accelerated ageing of airtightness products.

OBJECTIVES OF THE SESSION

The objective of this session is to

  • Present the “to be published” AIVC VIPaper that makes a critical review and a comparative analysis of research and technical studies that deal with building airtightness durability, covering both field and laboratory studies.
  • Present recent studies, both in laboratory and on-site
  • Explain the importance of implementation conditions

SESSION PROGRAMME

First part: On site measurement

  • Lesson learnt from the state of the art of the durability of airtightness: on-site measurements – Nolwenn Hurel, INIVE, France
  • Field study on the evolution of air tightness in 30 Belgian dwellings– Stijn Verbeke, University of Antwerp, Belgium
  • Lesson learnt and new protocol for the Durabilit’air 2 project – Bassam Moujalled, Cerema, France

Discussion with the Audience

  • Lesson learnt from the state of the art of the durability of airtightness: laboratory measurements – Valerie Leprince, Cerema, France
  • Impact of implementation conditions on the durability – Nolwenn Hurel, INIVE, FR
  • Lesson learnt and new protocol for the Durabilit’air project: laboratory measurement – Andrés Litvak, Cerema, France

 Discussion with the Audience

SESSION CHAIRS

  • Leprince Valérie, Cerema, France
  • Litvak Andrés, Cerema, France

SESSION DURATION

  • 90 minutes