Air leakage detection – reliably identifying leaks
Leaks in the building envelope can cause energy losses and, over time, moisture damage. Air leakage detection is therefore an important part of a BlowerDoor test, enabling weak points in the building envelope to be reliably identified and documented.
How are leaks detected?
During a BlowerDoor test, a defined negative pressure is created inside the building. This causes outside air to enter through existing gaps. The resulting airflow can be made visible using various tools.
Examples include:
- Smoke pencils
- Anemometers
- Fog generators
- Thermal imaging cameras
Typical air leaks
Leaks frequently occur at the following locations:
- Connections around windows and external doors
- Roof windows and dormers
- Pipe and cable penetrations
- Junctions between different building materials
- Attic access hatches
- Extensions and bay windows
- Joints and connections between building components
Why detecting leaks during construction makes sense
If leaks are identified during construction, they can generally be repaired with relatively little effort. After completion, many connections are no longer accessible, making remedial work considerably more difficult.
Air leakage detection during construction therefore supports quality assurance and helps prevent subsequent structural damage and unnecessary energy losses.
Conclusion
Air leakage detection is an important part of a BlowerDoor test. It supports quality assurance by revealing leaks so that they can be properly sealed, helping the building remain airtight over the long term.
Frequently asked questions about air leakage detection
How can leaks in the building envelope be located?
During air leakage detection, a BlowerDoor test creates a defined negative pressure inside the building. Outside air then enters through existing gaps. The resulting airflow can be investigated using tools such as a smoke pencil, an anemometer, fog generators or a thermal imaging camera.
Where are air leaks most commonly found?
Typical weak points include connections around windows and external doors, roof windows, dormers, and pipe and cable penetrations. Attic hatches, extensions, bay windows and junctions between different building materials can also contain leaks. Careful inspection of component connections and penetrations is therefore particularly important.
Why is it useful to detect leaks during construction?
Testing during construction makes it possible to identify leaks while the relevant connections are still accessible. They can therefore usually be repaired with less effort. Once the building is complete, many areas are concealed, making any necessary remedial work considerably more involved.