Air Tightness Test Checklist

Are you ready for an Air Tightness Test?

The dwellings need to be largely completed for the test, with the envelope sealed as required to create the air-barrier. Carpets or other floor coverings do not have to be in place.

The fan equipment requires 240v electrical supply, so the sockets ideally need to be live in the plots to be tested.

To ensure compliance with the building regulations certain conditions should be in place prior to the engineer attending site. 

  • The building envelope should be in a finished state (ready to be occupied), i.e. doors, windows (any cladding if applicable) should be fitted.
  • Any boxed in elements are sealed i.e. waste pipe/soil pipe/duct work for MVHR systems
  • Door and window thresholds and frames are sealed
  • Light fittings fitted and down lighters sealed
  • Sockets and light switches fitted
  • Access panels and loft hatches fitted
  • Bath panels fitted and sealed
  • Plumbing fittings permanently sealed
  • Skirting boards fitted and sealed
Air testing door
Leakage around sink waste
No sealant around the sink waste
Plasterboard dabs air leakage
Major air leakage through the plasterboard dabs void

Examples of the Common Areas of Leakage

  • Around boiler flues
  • Through and around doors – particularly double doors
  • Around loft hatches
  • Around water and heating pipes that penetrate into hollow floor voids and partition walls
  • Cracks or holes through a masonry inner leaf
  • Around supplies from external meter boxes
  • Gaps around pipes to cold water and/or heating header tanks
  • Between and around sections of suspended floors
  • Beneath doors and door frames
  • Through windows and/or hollow window frames
  • Roof Lights
  • Around and through wall-mounted extract fans, cooker hood vents, tumble dryer vents
  • Around waste pipes, gas and water supplies, cables, which penetrate the lower floor and through walls
  • Along the top and bottom edges of skirting boards
  • Beneath inner window sills and around window frames
  • Through gaps behind plasterboard on dabs or hollow studwork walls
  • Around waste pipes passing into floor voids or boxed in soil stacks
  • Around wall mounted fan or radiant heaters; around and through fused spurs and pull switches
  • Around and through recessed spotlights
  • Hole around the top of a soil stack

Air Testing Plot Checklist

It is recommended that the building fabric has a suitably robust air barrier installed. In the event that the final finishes are used as the air barrier this is a simple check list which simplifies what needs to be sealed prior to the air testing. In some cases you may not be able to seal all items listed.
Item No Item Description Tradesperson Responsible
1 240V Electric Sockets Provided By Site To Operate Electrician
2 Mastic Seal All Skirting Boards (Top & Bottom). Joiner / MasticMan
3 Seal Skirting Boards/Plasterboard To The Floor Under The Kitchen Units. Joiner / MasticMan
4 Silicone Seal Kitchen Waste And Water Pipes Flush With Plasterboard. Plumber / Kitchen Fitter
5 Seal Around Boiler Pipes And Flue Pipes. Heating Engineer
6 Once The Fan Kitchen Extract/Hood Ducting Is Installed It Needs Fully Sealing Around. Electrician / Kitchen Fitter
7 Install Any Kitchen Lights And Switch/Socket Face Plates. Electrician
8 Seal Around Any Ground Floor Toilet Waste Pipes And Water Pipes. Before The Boxin Is Fitted Make Sure The Pipes Are Sealed Plumber
9 Seal Around All Boxing In The Ground Floor Toilet. Joiner / Plumber
10 All Windows Need To Be Sealed And Window Sill Boards Needs A Silicone Seal. Joiner / Window Fitter / MasticMan
11 Radiator - Seal Around The Back Of The Push-Fit Caps And Flex-Pipes. Plumber / Joiner
12 Door Threshold Need To Be Mastic Sealed To The Floor. Joiner / Window Fitter
13 Door Draught Strips Need To Be Installed. Joiner / Window Fitter
14 Any Floor Penetrations For Electrical Cables/Pipework Need To Be Sealed With Silicone. Electrician
15 Upstairs Bathroom Pipework Under Bath Needs To Be Sealed Plumber / Joiner
16 Under Bath – Plasterboard Needs Mastic Sealing To Floor And Any Holes In Plasterboard Need Sealing Before Bath Panel Is Fitted. Plumber / Joiner / MasticMan
17 Waste Pipe Boxing In Upstairs Bathroom Requires Fully Mastic Sealing Around. Plumber / Joiner / MasticMan
18 Bathroom Extract Needs To Be Fully Sealed To Wall/Ceiling. Electrician
19 Bath Panel Needs Fitting And Any Penetrations Behind Panel Need Sealing Plumber / Joiner
20 Any Boxing In Upstairs Bathroom(S) To Be Sealed Around With Mastic. Plumber / Joiner / MasticMan
21 Loft Hatch Need To Be Installed. Joiner
22 Loft Hatch Needs Frame To Be Sealed Around With Caulk. Joiner / MasticMan
23 Any Large Holes Or Voids Cut In Plasterboard To Be Fully Patched. Joiner