Blower door tests


Energy-saving buildings require an airtight building shell. On the one hand, for the prevention of damage from humidity in the cross section of external building components, and on the other to reduce uncontrolled ventilation-heat loss via leaky building components and component connections in particular.

Therefore, as part of our consultancy on thermal and humidity protection, we develop a concept for the airtight sealing of the building shell. The general process for the airtightness level and the associated detailed solutions for component connections as well as penetrations is then established.

The existing airtightness of the building in question or the airtightness of the building shell obtained from the implementation of measures can be ascertained by airtightness measurements. BlowerDoor measurement is a proven method that is based on the differential-pressure method.

BlowerDoor measurements provide so-called n50 value results, which indicate the air exchange rate per hour at a pressure difference of 50 pascals between the interior and exterior. In order to identify leakage with a valve effect, measurements are taken at above and below atmospheric pressure.  The measurements are taken and evaluated according to the parameters and standards specified in DIN EN 13829 (ISO 9972:1996, amended).

The actual measurement of airtightness is supplemented by a careful leakage detection procedure, in which the internal building component connections, in particular, are examined for imperfections. In addition to the traditional method using thermal anemometers, Müller-BBM also uses thermal imaging cameras for leakage location and documentation.

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