ATTMA Technical Standard L1: Measuring air permeability in the envelopes of dwellings

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This document, released by the Air Tightness Testing & Measurement Association (ATTMA), provides the technical standard to be followed for the testing of dwellings in the UK as set out in Building Regulations and specifying documents around the world.


This Technical Standard sets out to provide detailed guidance and clarification of BS EN 13829:2001: “Thermal Performance of Buildings. Determination of air permeability of buildings. Fan pressurisation method” and ISO 9972:2015: “Thermal performance of buildings - Determination of permeability of buildings – Fan pressurization method”, in order to ensure consistency by testing companies.


To download and read the full document  please click on the link provided below.