Preparing for Air Tightness Testing

Before conducting an air tightness test, certain steps must be taken to ensure that the test provides accurate results. These steps involve preparing the building for testing.

Firstly, all windows and external doors must be closed tightly. This is because the fan used in the test creates a pressure difference between the inside and outside of the building. If any openings are left unsealed, they can affect the accuracy of the test results.

Secondly, any mechanical ventilation or HVAC systems should be turned off during the test. This is because these systems can interfere with the airflow and pressure inside the building, which can lead to inaccurate test results.

Thirdly, any other sources of air leakage, such as chimneys or vents, should be temporarily sealed during the test. This ensures that the test accurately measures the overall air tightness of the building. If you’d like to know what temporary seals are allowed for air testing, you can find this on the ATTMA website here

For an air test, you must seal:

• Mechanical ventilation systems such as bathroom, kitchen and cooker hood extractors.

• Trickle Ventilators

• Air Conditioning grilles

• Passive Ventilation such as air bricks to outside, passive stacks and sub floor ventilation systems

• Chimney Flues

• The door with the air testing fan, if the canvas doesn’t fit neatly into the doorway

You can’t seal:

• Electrical sockets

• Downlights

• Bath Panels & Shower Trays

• Loft Hatches & Access Panels

• Doors to cupboards or storage areas, including doors to garages

• External Doors & Windows

In addition to these preparations, it is also essential to ensure that the testing equipment is calibrated correctly and that the testing team is experienced and knowledgeable in conducting air tightness tests. Our team have over two decades of air testing experience, with UKAS accreditation (4088) so you can be sure we carry out tests impartially and in accordance with Building Regulations.

With proper preparation,  air tightness testing  can provide accurate and reliable results, allowing building owners and managers to identify areas for improvement and make changes to improve energy efficiency.

If you're looking to book an air tightness test, we'd love to help! Our experienced and knowledgeable team is fully equipped to conduct accurate and reliable tests in accordance with building regulations. We understand that the preparation process can be daunting, but we'll guide you every step of the way to ensure that the test provides accurate results. Whether you're a contractor or building owner, our tests can help you identify areas for improvement to improve energy efficiency. Contact us today to book your air tightness test!