English

Purpose of the work 

Purpose of the work 

In Denmark, a manufacturer and dealer of vapor barrier membranes has observed unusual behavior. The membranes were installed in a small house and show that the system can be set up and be tight. What is interesting is that the airleak range changes over time, and becomes approx. twice as leaky over two months, but then the curve also flattens out, and becomes fixed. 
The observation will be presented, and the presentation is an invitation that others might want to do more research into this. 

Purpose of the work  
To which extent do leaky exhaust air dampers in extractor systems impact energy-efficient buildings?  
To which extent do such dampers influence Blower Door tests? 

Method of approach 
Measurements at the test stand and calculation 

We all know that the airtight or sufficiently air-impermeable (which is the physically correct term) building design is state-of-the-art, i.e., complies with the “Recognized and Generally Accepted Good Engineering Practices”. It is relatively easy to achieve a sufficiently air-impermeable design for new buildings when ensuring that it is carefully planned and executed and that the design is quality-controlled.  

This presentation is the recording of the first 100 airtight tests in Greece, from 2010 until today. The inspections were carried out in private homes and in large-scale commercial buildings, of different construction dates, renovated or not, in various cities of the country and on islands. Most of the inspections were carried out in the area of Attica and in the city of Athens.

Aside from amending terms and definitions, the purpose of the national Annex NA is to introduce “Procedure 3”. The annex has the purpose to ensure that the measuring method is feasible in Switzerland and that the airtightness quality in buildings is good. The building preparation, for instance, is slightly different compared to the previous method. There is a tendency to tape off fewer components to promote good workmanship.  

The book of proceedings of the 12th International BUILDAIR Symposium "Airtight Buildings, Thermography and Ventilation Systems in Practice",  held on June 25-26  2021. Contains 36 abstracts.

AIVC's Ventilation Information Paper #45.8 summarizes current knowledge on trends in building and ductwork airtightness in China.

AIVC's Ventilation Information Paper #45.7 summarizes current knowledge on trends in building and ductwork airtightness in Greece.

A recorded presentation covering this topic is also available at this link.