Introduction: aims of this guide; target audience; how to use this guide -- The context: infiltration, ventilation and airtightness; why build airtight?; legislation; measurement; targets -- Designing airtight buildings: performance specification; layers and zones; design; detailed specification -- Implementing airtight buildings: plan of work; roles and responsibilities; inspection; testing and audit schedule; remedial airtightness works -- Testing airtightness: climatic conditions; the test itself; air leakage audits; component testing -- The details: double leaf concrete block; timber frame; steel frame with curtain walling; refurbishment of masonry building; concrete frame and pane

Looks at the benefits of airtightness in buildings, which helps to address energy loss through leakage. Offers practical guidance on conserving energy, reducing costs and protecting building fabric. Aims to encourage designers to address these issues at the start of a project, thus avoiding expensive and time consuming remedial works.