Common Air Leakage Paths that May Cause Air Tightness Test Failures

Common Air Leakage Paths that May Cause Air Tightness Test Failures
Using our considerable experience in regards to air leakage test failures and smoke testing to find air leakage paths, we have built up a good understanding as to the to the most common air leakage paths in residential and commercial buildings.

Here is a list of the most common areas that may result in air tightness test failures:

General Items (Air Test Failure Risk 8/10)

  • Large gaps left around services that penetrate through the floor e.g. soil pipes etc.
  • Gaps between floorboards.
  • Around the perimeter of the floor and walls junction – air escapes behind the dot and dab plasterboard.
  • Joists that penetrate into wall construction:
  • Masonry walls: Gaps left around joists that penetrate into the inner leaf of external walls. Air leakage from the cavity into the upper floor void leaking into the dwelling through gaps between flooring and through any penetrations in the ceilings, eg recessed lights and ceiling light roses.
  • Through electrical sockets where faceplates are missing.
  • Loft hatches not fitting properly or the seals are missing.
  • Around recessed ceiling lights.

Window/Door components (Air Test Failure Risk 6/10)

  • Doors and windows that have poor seals that do not close tightly resulting in large air leakage paths.
  • Trickle vents are damaged or missing
  • The frames are twisted do the doors and windows are not sitting tight against the seals.
  • The door/window handles are damaged and are not closing properly.
  • Missing/broken window panes.
  • Under door & window cills at the cill/wall junction.

Kitchen Units (Air Test Failure Risk 9/10)

  • Large gaps left around services that penetrate through the wall behind the kitchen units.
  • Large Gaps around poorly fitted extractor fans and cooker hoods around the wall and the ventilation duct.
  • Large gaps around the floor/wall junction.
  • Holes not sealed around the bottom of the domestic service riser.

Bathrooms (Air Test Failure Risk 8/10)

  • Large Gaps around bath panels
  • Large gap around penetrations under the bath
  • Gaps around the sink waste
  • Large gaps around the toilets SVP where it terminates into service boxing.
  • Gaps to the rear of the toilets – especially prevalent around wall mounted toilets.

Boiler Cupboards (Air Test Failure Risk 9/10)

  • Large gaps left around services that penetrate through the walls, floors and ceilings.
  • Large gaps around ventilation flue.
  • Large gaps around the floor/wall junction behind the boiler.
  • Holes not sealed around the bottom of the domestic service riser.

If you would like more information in regards to your air tightness test and how you can reduce the chance of an air test failure please contact us now at info@airpressuretesting.net or contact us on 02036 692560.