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Purpose of the work
ISO 9972 describes the measurement procedure and calculation methods for determining the air permeability of buildings using the fan pressurization method. However, recent works have strongly underlined the need to improve the method's reliability and the uncertainty evaluation. The objective of this presentation is to present last discussions and decisions in the process of revising ISO 9972..
Method of approach
Before launching the revision of ISO 9972, an international working group (mainly researchers) has been gathered to list existing issues with the current standard and propose alternative solutions. In September 2023, an official ISO working group (ISO/TC163/SC1/AHG 10) has been created to officially launch the revision.
Content of the contribution
This contribution will present proposed changes in ISO 9972 that aims at improving, its relevance, its accuracy and also its consistency with other standards (national standards, ASTM, etc.).
It includes:
- Changes in terms and definition to be consistent with other standards and terminology rules
- Requirements in Maximum Permissible Measurement Error (MPME) for the apparatus
- Improving measurement procedure (location of pressure gauges), single-point testing alternative, high-rise buildings specificities
- New alternative methods for the linear regression.
- Additional informative annexes to better test specific buildings (high-rise, very tight, sampling, etc.) and to improve building preparation.
Results and assessment of their significance
For more than a decade now, in more and more European countries, tens of thousands of airtightness test are performed every year to guarranty low energy buildings performance. Additionnaly a lots of research work has been performed to better understand the physic behind airtightness test. This work compile the experience of the last 10 years to improve the standard.
Conclusions
ISO 9972 is now on the process to be revised to improve its usability, relevance and accuracy. This shall contribute to promote airtightness testing among stake holders and decision makers.
For further information please contact Valérie Leprince at: valerie.leprince@cerema.fr