Air Tightness Testing

What is Air Tightness Testing?

Air tightness testing (also known as air permeability and air leakage testing) is undertaken to determine a building’s air permeability rating, most commonly in order to demonstrate Part L compliance.

Air leakage is a significant cause of heat loss, and is therefore a major contribution to energy inefficiency in buildings. For this reason, Part L of the Building Regulations requires new buildings to meet specific air permeability targets.

Air tightness testing should be undertaken when buildings are virtually complete and under calm weather conditions. Depending on the size, complexity and height of the building, either large trailer-mounted fans or smaller electric ‘blower-door-fans’ are used to undertake the air tightness tests.

Air Tightness Services

Operating throughout the UK, Stroma Tech has delivered air tightness testing on a variety of buildings, including dwellings, office buildings, educational establishments, hospitals, superstores, factories and warehouses.

Sample Area of ‘Comfort’ Air Tightness Testing

An initial air tightness test is carried out on a sample area to give an indication of how the whole building will perform and what the key air leakage issues will be.

Final Acceptance Air Leakage Testing

Once the final stages of construction have been finalised and any pre-inspections fulfilled, a final test is required.
The final test includes all necessary building envelope calculations and is carried out using multi-point testing methods to ensure an even pressure distribution, and thus, reliable results. In large complex buildings, this approach, along with our ability to depressurise the building, can be vitally important.

Post Test Leakage Diagnosis

If a building fails to achieve the required air permeability rating, Stroma Tech’s technicians will carry out smoke testing methods to identify and advise on any remedial works in an illustrated report.

UKAS Accredited Air Tightness Tests

Stroma Tech is a UKAS accredited testing laboratory No. 2731 and a member of ATTMA (Air Tightness Testing & Measurement Association), giving you assurance of a high-quality service and a robust test result. The air tightness test itself is a relatively straightforward process; most tests and any post-test leakage diagnosis are completed in a day or less.

Air Tightness Testing

Stroma Technology Ltd is a UKAS accredited testing laboratory No. 2731 and a member of ATTMA.

Stroma Tech Credentials
  • Market leader, established in 2002
  • Full accreditation (UKAS & ATTMA)
  • 20,000 + air tightness tests completed
  • Experienced Air Tightness Consultants
  • In-house air sealing capability
  • UK coverage
  • Competitive prices
Service Levels
  • Fast report turnarounds of 24/48 hours
  • Envelope calculations included
  • All-day audits
  • Initial briefing meeting
  • Thorough site inspection
  • Fully referenced report written on site
  • Same-day handover
  • Free of charge post test audits after failed tests
  • Fan hire service
  • Component testing
  • Project Management available
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Phil Carr