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Notes/comments

The main changes from the previous fifth edition, Amendment 1 of H1/AS1 are:

• The schedule method has been removed from the acceptable solution.
• In the calculation method, the minimum construction R-value for slab-on-ground floors has been removed. The minimum construction R-values for roofs, walls, and floors other than slab-on-ground floors are now specified directly instead of a percentage of R-values in the reference building equation.
• For multi-unit dwellings and 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.
• The performance table for windows and doors in housing in Appendix D. has been revised to better reflect commonly used window specifications.
• 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.
• Portions of text have been re-written to enhance clarity in the document and provide consistent language with other acceptable solutions and verification methods.