In January 2015, the ATTMA Scheme for Competent Air Tightness Testing Firms and their Testers (The ATTMA Scheme) was launched. It is an industry competence scheme authorised by the DCLG and specified in Approved Document L1 & L2 of the Building Regulations. It is based on the performance criteria and knowledge requirements set out in the suite of National Occupation Standards (NOS) and under the requirements of the Minimum Technical Competence (MTC) document.
There are three levels of tester:
: Testers can test dwellings and non-dwellings up to 4000m3
gross envelope volume when tested as a single entity, with a single fan.
: Testers can test all buildings except large, complex and or high-rise buildings and or phased handover or zonal buildings unless part of a team managed by a Level 3 tester.
: Air tightness experts who can cover large, complex and or high-rise buildings and or phased handover or zonal compartmentalisation.
View Exova's ATTMA listing here