Blower-Door-Test

The blower-door test is a pressure difference measuring method, which can be used to check airtightness in new and old buildings.

In the first phase of the test, negative pressure is generated in the house and it is observed where air enters the building. Subsequently, air is blown in and pressure is created. Here, too, it is observed whether and where leakage occurs and air escapes from the building. If the so-called air exchange rate is too high, i.e. too much air enters or exits, then action should be taken. The examiner uses special devices to search for these leaks, mark them and provides information about the areas which need to be reworked. Typical leakage points are power outlet, window sills or ducts.

The blower door test is therefore a good opportunity to identify and seal the weak points early on. In addition, severe structural damage can be avoided and heating costs can be reduced.

The price for such a test depends on the size of the building and lasts on an average three hours.