External moisture guide to E2/AS1 risk matrix
- Valid from
- Information provider
- Ministry of Business, Innovation and Employment
- Information type
- Section 175 guidance
- Website, PDF
This guide is a companion guide to Acceptable Solution E2/AS1 for Building Code clause E2 External Moisture. It can help designers, builders, councils and building owners understand potential weathertightness risks of a proposed design and options to either manage or reduce them.
This guidance discusses the principles of weathertightness risk assessment, explains the six risk factors of the risk matrix in more detail, and provides three worked examples for different building designs.