Common Air Leakage Paths Identified During Air Tightness Testing for PAS 2035

Common Air Leakage Paths Identified During Air Tightness Testing for PAS 2035

In our experience, the more complete a development, the more likely it is to achieve a low air leakage figure. When we send out our quotations, we also forward an informative air leakage checklist to help clients prepare for their air tightness test for PAS2035. By working with customers throughout the retrofit stages, we can provide advice and guidance on the most feasible ways to avoid air leakage and attain compliance for the air tightness test for PAS2035.


Here is a list of the most common air leakage paths identified during our air tightness and smoke leakage testing:

            1. Poorly installed windows and doors which do not close tightly against frames.
            2. Windows and doors with missing seals.
            3. Damaged trickle vents to window and door frames
            4. The gap at the wall/skirting board junction.
            5. Gaps through existing floorboards to all floors.
            6. Perimeter and internal wall/floor junctions.
            7. Gaps around service penetrations (such as water and electrical) through floor and walls
            8. Pathways through ceiling voids into masonry cavity walls
            9. Pathways through eaves in cavities
            10. Gaps around windowsills and door reveals
            11. Gaps around bathroom and WC services
            12. Gaps around kitchen and utility services.
            13. Gaps between dry lining and ceilings
            14. Unsealed chimneys
            15. Gaps around electrical and IT fittings
            16. Gaps around ceiling loft hatches
            17. Ventilation penetrations through the walls, ceiling, and roof
            18. Poorly installed extractor fans to kitchens, utility, and bathrooms

If fail your air tightness test, don’t panic! We can undertake smoke leakage testing to identify air leakage paths in your building, as well as providing a comprehensive smoke survey report, to allow for targeted remedial sealing works by your team.


We can help you pass your air tightness test for PAS 2035

We have large amount of experience in understanding the requirements of Approved Document L and PAS 2035, along with extensive experience of carrying out thousands of successful air tightness tests on a wide range of developments across London and the UK.

You can rest assured that we provide the highest quality service for all your air tightness testing and reportage. We are a UKAS accredited laboratory, as well as being certified to ATTMA Level 2.

If you would like more information in for our PAS 2035 air tightness testing services, please contact us at  or visit our call us on 01525 303905. Alternatively, please see a copy of our air leakage checklist to help you prepare for your PAS2035 Air Test.