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Acceptable Solution E2/AS1: External moisture provisions for timber-framed buildings up to 10 m in height

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Abbreviation
E2/AS1 (Fourth edition)
Version
Fourth edition
Valid from
28/07/2025
Information provider
Ministry of Business, Innovation and Employment,
Information type
Acceptable Solution,
Format
PDF,
Cites
This resource cites 55 documents (show Citations)
Description

E2 External Moisture Acceptable Solution E2/AS1 Fourth Edition provides a compliance pathway for meeting the weathertightness performance requirements of Clause E2 of the New Zealand Building Code for buildings up to 10 metres in height.

It applies to buildings within the scope of NZS 3604 and covers a wide range of cladding systems, including masonry veneer, stucco, timber weatherboards, fibre cement, profiled metal, plywood, and EIFS.

The document includes a risk matrix to assess weathertightness risk and determine appropriate cladding solutions. It includes detailed requirements for materials, flashings, roof and wall junctions, decks, parapets, roof cladding, wall cladding, and construction moisture.

The fourth edition features a revised layout, updated references, and integration with the Building Product Specifications for windows, fixings, and membranes.

Scope

This acceptable solution covers external moisture provisions for timber-framed buildings within the scope of NZS 3604. It is limited to the materials, products and processes contained herein, and limited to buildings:

  • a) up to 3 storeys with a height measured from lowest ground level adjacent to the building to the highest point of the roof (except for chimneys, aerials and the like) of 10 m or less; and
  • b) with floor plan area limited only by seismic and structural control joints; and
  • c) external walls that are vertical, and roofs that are 60° or less above the horizontal.

Where buildings are based on NZS 3604, but require specific engineering design input, the framing shall be of at least equivalent stiffness to the framing provisions of NZS 3604.

Attached garages that are integral with the weathertightness envelope of the building are included within the scope of this acceptable solution (refer to Paragraphs 9.1.2.7 and 9.1.1.6).

Items outside the scope of this document

  • Buildings, components, or junction details not included or shown in this document are outside the scope of this acceptable solution.
  • Outbuildings, such as stand-alone garages and other structures that are unlined, are outside the scope of this acceptable solution. 
  • Buildings with drained cavities and spread of flame requirements, as specified Building Code clause C Protection from fire, are outside the scope of this acceptable solution. Cavities in such circumstances must be specifically designed for both weathertightness and spread of flame.
  • Buildings with drained cavities and acoustic requirements, as specified in Building Code clause G6 Airborne and impact sound, are outside the scope of this acceptable solution.
  • Specific design for preventing the ingress of snow melt water is required when the open ground snow load Sg, as defined in NZS 3604, exceeds 1.0 kPa, and the roof is constructed in a way that is likely to cause a build-up of snow.
Previous versions:
E2/AS1 (Amd 10) (Third Edition, Amendment 10)
E2/AS1 (Amd 9) (Third Edition, Amendment 9)
E2/AS1 (Amd 8) (Third Edition, Amendment 8)
E2/AS1 (Amd 7) (Third Edition, Amendment 7)
E2/AS1 (Amd 6) (Third Edition, Amendment 6)
E2/AS1 (Amd 5, Errata 2) (Third Edition, Amendment 5, Errata 2)
E2/AS1 (Amd 5) (Third Edition, Amendment 5)
E2/AS1 (Amd 4) (Third Edition, Amendment 4)
For assistance with locating previous versions, please contact the information provider.
Notes/comments

This acceptable solution is the fourth edition of E2/AS1. The main changes from the previous version are:

  • The document has been published in a standalone format and the layout has been revised to improve clarity.
  • Cross-references to headings, paragraphs, tables, and figures have been revised to reflect the revised structure of the document.
  • Minor amendments have been made to correct typos, grammar, cross-references, punctuation, wording, and formatting of the document.
  • A title has been provided to the document to reflect the general scope of the acceptable solution.
  • The acceptable solution now refers to the Building Product Specifications for the specification of windows and doors, fibre cement, fibreglass reinforcing mesh and EIFS.
  • References have been revised to reflect the documents cited in this acceptable solution.
  • Definitions have been revised to reflect the terms used in this acceptable solution. 
  • Tables for the selection of materials, compatibility of materials, properties of underlays, and fixings have been relocated to Appendix C. 
  • Examples for using the risk matrix have been relocated to Appendix D.  
View on Information Provider website Download this resource (PDF, 22.4MB)
For assistance with locating previous versions, please contact the information provider.

This acceptable solution is the fourth edition of E2/AS1. The main changes from the previous version are:

  • The document has been published in a standalone format and the layout has been revised to improve clarity.
  • Cross-references to headings, paragraphs, tables, and figures have been revised to reflect the revised structure of the document.
  • Minor amendments have been made to correct typos, grammar, cross-references, punctuation, wording, and formatting of the document.
  • A title has been provided to the document to reflect the general scope of the acceptable solution.
  • The acceptable solution now refers to the Building Product Specifications for the specification of windows and doors, fibre cement, fibreglass reinforcing mesh and EIFS.
  • References have been revised to reflect the documents cited in this acceptable solution.
  • Definitions have been revised to reflect the terms used in this acceptable solution. 
  • Tables for the selection of materials, compatibility of materials, properties of underlays, and fixings have been relocated to Appendix C. 
  • Examples for using the risk matrix have been relocated to Appendix D.  
This resource is not cited by any other resources.

Acceptable Solution E2/AS1: External moisture provisions for timber-framed buildings up to 10 m in height

This document is not CITED BY any other resources:

Acceptable Solution E2/AS1: External moisture provisions for timber-framed buildings up to 10 m in height

Description

E2 External Moisture Acceptable Solution E2/AS1 Fourth Edition provides a compliance pathway for meeting the weathertightness performance requirements of Clause E2 of the New Zealand Building Code for buildings up to 10 metres in height.

It applies to buildings within the scope of NZS 3604 and covers a wide range of cladding systems, including masonry veneer, stucco, timber weatherboards, fibre cement, profiled metal, plywood, and EIFS.

The document includes a risk matrix to assess weathertightness risk and determine appropriate cladding solutions. It includes detailed requirements for materials, flashings, roof and wall junctions, decks, parapets, roof cladding, wall cladding, and construction moisture.

The fourth edition features a revised layout, updated references, and integration with the Building Product Specifications for windows, fixings, and membranes.

View on Information Provider website Download this resource (PDF, 22.4MB)
Acceptable Solution E2/AS1: External moisture provisions for timber-framed buildings up to 10 m in height
Description

E2 External Moisture Acceptable Solution E2/AS1 Fourth Edition provides a compliance pathway for meeting the weathertightness performance requirements of Clause E2 of the New Zealand Building Code for buildings up to 10 metres in height.

It applies to buildings within the scope of NZS 3604 and covers a wide range of cladding systems, including masonry veneer, stucco, timber weatherboards, fibre cement, profiled metal, plywood, and EIFS.

The document includes a risk matrix to assess weathertightness risk and determine appropriate cladding solutions. It includes detailed requirements for materials, flashings, roof and wall junctions, decks, parapets, roof cladding, wall cladding, and construction moisture.

The fourth edition features a revised layout, updated references, and integration with the Building Product Specifications for windows, fixings, and membranes.

View on Information Provider website Download this resource (PDF, 22.4MB)
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Acceptable Solution E2/AS1: External moisture provisions for timber-framed buildings up to 10 m in height

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