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:
Level 1: Testers can test dwellings and non-dwellings up to 4000m3 gross envelope volume when tested as a single entity, with a single fan.
Level 2: 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.
Level 3: Air tightness experts who can cover large, complex and or high-rise buildings and or phased handover or zonal compartmentalisation.
ATTMA is approved by DCLG and are listed in the Building Regulations as an authorised Competent Persons Scheme for air tightness testing.
As an ATTMA Level 2 registered company, Exova is independently audited and certified by UKAS and certified by ATTMA with a scope covering air tightness testing to the ATTMA Technical Standards (TSL1 & TSL2) and BS EN: 13829 (2001), demonstrating knowledge and understanding, which enables us to test both commercial and domestic developments in accordance with relevant building regulations.