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Acceptable Solution H1/AS2: Energy efficiency for buildings greater than 300 m²

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Abbreviation
H1/AS2 (Second edition)
Version
Second edition
Valid from
27/11/2025
Information provider
Ministry of Business, Innovation and Employment,
Information type
Acceptable Solution,
Format
PDF,
Cites
This resource cites 13 documents (show Citations)
Description

Acceptable Solution H1/AS2 provides a means of compliance with Building Code Clause H1 Energy Efficiency. 

Clause H1 provides for the efficient use of energy and sets physical conditions for energy performance.

Acceptable Solution H1/AS2 can be used for buildings other than housing with an area of occupied space greater than 300 m².

For all housing, and buildings other than housing with an occupied space less than 300 m², refer to the Acceptable Solution H1/AS1 or Verification Method H1/VM1 as a means to demonstrate compliance or use an alternative means to demonstrate compliance.

Scope

The Acceptable Solution H1/AS2 does not include the use of foil insulation.

This Acceptable Solution does not apply to buildings with curtain walling. For these, use Verification Method H1/VM2 or use an alternative means to demonstrate compliance.

Previous versions:
H1/AS2 (First edition, Amd 1) (First edition, Amendment 1)
H1/AS2 (First edition) (First edition, unamended)
H1/AS1 (Amd 4) (Fourth edition, Amendment 4)
H1/AS1 (Fourth Edition, Amendment 3)
H1/AS1 (Third Edition, Amendment 2)
H1/AS1 (Third Edition (unamended))
For assistance with locating previous versions, please contact the information provider.
Notes/comments

The main changes from the previous first edition amendment 1 of H1/AS2 are:

  • The schedule method has been removed from the acceptable solution.
  • The calculation method has been amended to provide flexibility for the construction R-values of all building elements of a proposed building’s thermal envelope. The minimum construction R-values for roofs and floors have been removed.
  • For mixed-use buildings, the building may now be treated as having either a single thermal envelope, or multiple thermal envelopes, when demonstrating compliance using the calculation method.
  • The citation of NZS 4214 has been modified to enhance clarity of requirements for determining the thermal resistance of building elements containing thermal bridges.
  • The method for determining the thermal resistance of framed walls has been revised to better address typical levels of thermal bridging caused by wall framing members. As a consequence, the wall R-value in the reference building heat loss equations has also been reduced.
  • The application of minimum construction R-values of heated ceilings, heated walls and heated floors has been clarified, and these minimum construction R-values no longer apply where heated ceilings, heated walls or heated floors are installed solely in rooms that contain a shower, bath or toilet.
  • The method for determining the areas of roofs, walls and floors now requires the overall internal dimensions to be used.
  • References have been revised to reflect the documents cited in this acceptable solution in Appendix A.
  • Definitions have been revised to reflect the terms used in this acceptable solution in Appendix B.
  • Appendix E. Thermal resistance of slab-on-ground floors has been revised to address buildings that have a mix of cladding types and buildings with slab edge insulation that does not cover the entire floor perimeter. The performance tables have also been expanded to include a greater range of slab area-to-perimeter ratios.
  • The acceptable solution now refers to the Building Product Specifications for determining the thermal resistance of insulation materials. As a consequence, reference to AS/NZS 4859.1 has been removed from the acceptable solution with the applicable specifications located within the Building Product Specifications.
View on Information Provider website Download this resource (PDF, 1.5MB)
For assistance with locating previous versions, please contact the information provider.

The main changes from the previous first edition amendment 1 of H1/AS2 are:

  • The schedule method has been removed from the acceptable solution.
  • The calculation method has been amended to provide flexibility for the construction R-values of all building elements of a proposed building’s thermal envelope. The minimum construction R-values for roofs and floors have been removed.
  • For mixed-use buildings, the building may now be treated as having either a single thermal envelope, or multiple thermal envelopes, when demonstrating compliance using the calculation method.
  • The citation of NZS 4214 has been modified to enhance clarity of requirements for determining the thermal resistance of building elements containing thermal bridges.
  • The method for determining the thermal resistance of framed walls has been revised to better address typical levels of thermal bridging caused by wall framing members. As a consequence, the wall R-value in the reference building heat loss equations has also been reduced.
  • The application of minimum construction R-values of heated ceilings, heated walls and heated floors has been clarified, and these minimum construction R-values no longer apply where heated ceilings, heated walls or heated floors are installed solely in rooms that contain a shower, bath or toilet.
  • The method for determining the areas of roofs, walls and floors now requires the overall internal dimensions to be used.
  • References have been revised to reflect the documents cited in this acceptable solution in Appendix A.
  • Definitions have been revised to reflect the terms used in this acceptable solution in Appendix B.
  • Appendix E. Thermal resistance of slab-on-ground floors has been revised to address buildings that have a mix of cladding types and buildings with slab edge insulation that does not cover the entire floor perimeter. The performance tables have also been expanded to include a greater range of slab area-to-perimeter ratios.
  • The acceptable solution now refers to the Building Product Specifications for determining the thermal resistance of insulation materials. As a consequence, reference to AS/NZS 4859.1 has been removed from the acceptable solution with the applicable specifications located within the Building Product Specifications.
This resource is not cited by any other resources.

Acceptable Solution H1/AS2: Energy efficiency for buildings greater than 300 m²

This document is not CITED BY any other resources:

Acceptable Solution H1/AS2: Energy efficiency for buildings greater than 300 m²

Description

Acceptable Solution H1/AS2 provides a means of compliance with Building Code Clause H1 Energy Efficiency. 

Clause H1 provides for the efficient use of energy and sets physical conditions for energy performance.

Acceptable Solution H1/AS2 can be used for buildings other than housing with an area of occupied space greater than 300 m².

For all housing, and buildings other than housing with an occupied space less than 300 m², refer to the Acceptable Solution H1/AS1 or Verification Method H1/VM1 as a means to demonstrate compliance or use an alternative means to demonstrate compliance.

View on Information Provider website Download this resource (PDF, 1.5MB)
Acceptable Solution H1/AS2: Energy efficiency for buildings greater than 300 m²
Description

Acceptable Solution H1/AS2 provides a means of compliance with Building Code Clause H1 Energy Efficiency. 

Clause H1 provides for the efficient use of energy and sets physical conditions for energy performance.

Acceptable Solution H1/AS2 can be used for buildings other than housing with an area of occupied space greater than 300 m².

For all housing, and buildings other than housing with an occupied space less than 300 m², refer to the Acceptable Solution H1/AS1 or Verification Method H1/VM1 as a means to demonstrate compliance or use an alternative means to demonstrate compliance.

View on Information Provider website Download this resource (PDF, 1.5MB)
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Acceptable Solution H1/AS2: Energy efficiency for buildings greater than 300 m²

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