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This webpage defines the minimum equipment and calibration requirements for testers within the Air Tightness Testing & Measurement Association (“ATTMA”).
This document is in place for the benefit of the ATTMA Scheme’s Members and is to expressly define the equipment calibration requirements.
Testers must be familiar with and competent in the operation of any and all testing equipment they use to carry out air tightness tests in accordance with industry standards called for in Building Regulations, Parts L1 and L2, whether owned, borrowed or hired.
A record should be kept of all equipment used for testing and pre-completion testing including that which is not owned by the tester. Details of equipment used but not owned by the tester should be included in the information submitted for the next annual audit.
The requirements for equipment calibration is stated within ATTMA TSL1 and TSL2
All the following specification are required of all equipment used, which must all be undertaken by a UKAS accredited calibration laboratory.
Pressure differential measurement devices (micro-manometer) must be capable of measuring pressure differentials with an accuracy of ±2 Pascals in the range of 0 to ±100 Pascals.
Air flow rate measurement devices must have a flow measurement accuracy not greater than 7% of the reading.
Where multiple fans measurement systems are to be used in unison then the calibration of all individual units needs to be verified.
Temperature measurement devices must have an accuracy of ±1C within the range of -20C to +40C.
Barometric pressure measurement devices must have an accuracy of ±5 mbar in the range of 950 – 1050 mbar.
The Scheme Technical Manager and Managing Director will investigate and approve if appropriate the latest versions of:
• Energy Conservatory Tectite Software
• Retrotec Fantestic Software
• Any UKAS accredited firms using bespoke software will have had this scrutinised by UKAS and thus be approved.
• Any members wishing to use their own software must allow it to be checked during the audit process (standard data to aid checking can be provided prior to this).
Note: using approved software does not assure a correct result for the air tightness test is produced. The overall test set-up, test and input must be in harmony for the correct result.
Record Keeping
A record shall be kept of all equipment used for testing and pre-completion testing including that which is not owned by the tester. Equipment shall be uploaded to the ATTMA portal.
Using equipment that is not registered on the ATTMA Portal will results in instant suspension for the scheme.
Details of equipment used but not owned by the tester should be included in the information submitted for the next audit.
Testers should have procedures in place to ensure that borrowed or hired equipment is (a) in calibration and (b) preforming correctly.
Calibration certificates for borrowed or hired equipment must be presented if requested.
Ref: PUA007 – Issue 1.1
