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B2/AS1, 3rd edition


Current version: Effective on 28 July 2025

B2 Durability Acceptable Solution B2/AS1 Third Edition outlines how to meet the durability requirements of Clause B2 of the New Zealand Building Code for building elements. It provides guidance on determining required durability periods (5, 15, or 50 years) based on accessibility, detectability of failure, and structural importance. The document includes detailed tables assigning durability periods to various building components and systems. It also references the Building Product Specifications. The third edition also has revised layout, updated references, and expanded definitions.

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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: