What To Do If Your Building Fails An Air Tightness Test

Fortunately there is often a simple fix when a building fails an air tightness test, but the first step is to find out where there is a leak. Aurora are able to perform a number of tests to find these leaks:

  • Depressurisation – during the air pressure test the building will be pressurised. Once the test is complete the building begins to depressurise – as this happens draughts can be felt as the air comes back into the building. Any large draughts felt at this time are likely to indicate areas that will need to be addressed.
  • Smoke Testing – Aurora can either use smoke pencils, or fill the building with a harmless smoke and the pressurise the building again. The smoke will be seen as it escapes through any gaps showing exactly where leaks need to be stopped.
  • Thermography – we can use infrared technology to show hot and cold spots in the building and identifying leaks. It is easier to complete these test at night though as this is when the difference between the indoor temperature and the outdoor temperature is at its greatest.

Once the source of the air leakage has been found the leaks can be sealed or remedial works carried out, then the building can be retested. There are a number of common areas where leaks can occur so it is always worth paying special attention to these areas before your first air tightness test is carried out or if your building fails its air tightness test. See more information on common problem areas when conducting air tightness testing.

Common Problem Areas

Check for gaps where services enter and leave the building – especially in bathrooms and kitchens including hidden areas such as behind the bath panel, in a service box or behind kitchen units.

Look at areas where walls, floors and ceiling meet, especially around suspended floors

Check door and window surrounds and light fittings

Ensure loft hatch is a snug fit and has been sealed

Check that sealant has been used in all relevant areas such as around sockets and skirting boards