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| What evidence is required? |
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A test certificate from a test engineer and/or test body that is registered with the British Institute of Non-destructive Testing (BINDT). The test certificate should include sufficient information to describe the building tested eg location, type and size (the envelope area is an important component in calculating the air permeability and must be accurate) plus the design air permeability as well as the actual result. I would also expect the certificate to refer to BINDT registration and/or membership of the Air Tightness Testing & Measurement Association (ATTMA). This can be cross-referenced via their respective websites eg www.attma.org BINDT registration for Part L1 testing is based on training of individuals and calibration of their equipment or ATTMA membership. Registration for Part L2 requires ATTMA membership. ATTMA membership requires accreditation by the United Kingdom Accreditation Service (UKAS) to check test engineer competency, accuracy of equipment and consistency/appropriateness of procedures, plus a technical review of training, procedures and evidence. The test engineer/body should also produce a full test report that meets the requirements of ATTMA Technical Standard 1. This will include the building pre-test preparations as well as full test data and should be available from the contractor if required. |