The aim of this three-part Good Building Guide is to give the best advice on achieving airtightness in new buildings. It is based on data obtained from laboratory testing and observations made while undertaking air leakage audits in buildings. This first part (8 pages) describes the common air leakage paths and sets out the principles to follow when developing energy efficient construction details.

Parts 2 and 3 (available separately) provide practical guidance on airtightness techniques appropriate to most building types.

Part 1 Contents:

Why is air leakage a problem?

Avoiding air leakage

Design principles

Main structural elements

Sealing joints

Expansion joints

Penetrations

Concealed areas

Design for life

Avoid continuous voids

Construction practice

Inspection and supervision

Airtightness of buildings

Air leakage audits

Post construction

References and further reading