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E2/AS3, 4th edition


Concurrent version: Effective on 28 July 2025

E2 External Moisture Acceptable Solution E2/AS3 Fourth Edition provides a compliance pathway for meeting the weathertightness performance requirements of Clause E2 of the New Zealand Building Code, specifically for concrete and concrete masonry buildings. The scope is limited to buildings within the scope of CP01:2014 and focuses on the performance of the building envelope in preventing external moisture ingress. It is suitable for buildings using concrete or concrete masonry construction. The acceptable solution references CP01:2014 and outlines compliance with various E2 clauses related to water shedding, moisture penetration, and construction moisture. The fourth edition introduces a standalone format with a consistent structure.

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This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: