Cherwell Avenue, Kidlington


Client: Wolfpac Investments Ltd
Testing: L1 Air tightness testing, sound insulation testing and air flow rate measurements of ventilation
Lead Test Engineer: Tom Gregory


4 new apartments constructed to be in keeping with the existing housing stock

On completion of the build, Wolfpac asked Air Leakage Testing Ltd to carry out air tightness testing on the 4 flats for Part L compliance, sound insulation testing of the party walls and floors between the properties for Part E compliance and air flow rate measurements on the extract ventilation for Part F compliance.

As a result of a single test engineer completing all of the testing, it minimised time on site and costs.



As part of our standard pre-test telephone call, set-up, power and access requirements were discussed, timings were agreed and questions about the key areas that need to be completed were answered.

Testing was undertaken when all works were completed apart from the carpets being laid.



The target for the air tightness testing was under 5m3/h/m2@50Pa. Our accredited test engineer carried out the air tests first, this identified a few areas that required some extra sealing. This work was completed by site whilst other test was completed and the air tests were repeated as part of the same visit to achieve the pass.

A full set of 6 sound insulation tests on flats was completed successfully whilst other work was going on, the timing of work and testing was co-ordinated with the other trades to minimise disruption to site and avoid impacting the readings. The testing included 2 airborne sound insulation tests on party walls (upstairs and downstairs), 2 airborne sound insulation tests on party floors (downstairs to upstairs) and 2 impact sound insulation tests on floors (upstairs to downstairs). Airborne sound tests were conducted using a loud speaker to represent noise from TV, music, conversation, etc and the impact sound tests and were done using a tapping machine to mimic footfall. Both types of test achieved the requirements of Approved Document E for new buildings i.e. MORE than 45 dB of sound insulation for airborne noise reduction and LESS than 62 dB for impact noise.

The air flow rates of the cooker hoods and bathroom extract vents were measured, the requirements for Approved Document F were met in all cases apart from one, the test engineer suggested that the issue may relate to the flexible ducting being too long and, as a result, being concertinaed which was reducing the opening for the air. Site were quick to shorten the hose and the engineer repeated the measurement to confirm compliance there and then.


“It was a great help, and cost saving, to have one person able to carry out all the tests in one hit. It also meant there was flexibility on the day of test to switch between tests to allow other work to be completed”

Shabir, Wolfpac Investments