Skip to main content Skip to main navigation Skip to site search Skip to navigation within this section

Breadcrumbs

Home ›
Building and energy › Building and construction › Building and construction consultations › Consultation document: Insulation requirements in housing and other buildings › 3. Insulation in large buildings ... › 3.15. Summary of the proposals for large buildings

3.15. Summary of the proposals for large buildings

Summary of proposals to change Acceptable Solution H1/AS2 and Verification Method H1/VM2.

On this page

TABLE 3-2: Summary of proposals to change Acceptable Solution H1/AS2 and Verification Method H1/VM2

Outcome Potential changes
Optimising insulation to better balance upfront building costs and longer-term benefits.
  • Remove the schedule method from Acceptable Solution H1/AS2, leaving the calculation method and modelling method as compliance pathways.
  • Amend the calculation method to allow flexibility for the R-values of all building elements that form part of a building’s thermal envelope, not just walls, doors and windows.
  • Exempt buildings from the higher minimum R-values for heated building elements where embedded heating systems are solely used in bathrooms.
Consistency and certainty of compliance and consenting.
  • Clarify and update requirements for the modelling method by:
    • Prescribing the use of the most recent weather files from NIWA
    • Removing the requirement to model HVAC systems
    • Adding a new requirement for modellers to document and justify any deviations from default assumptions.
  • Limit the permitted area of skylights in the schedule method to 1.5% of the roof area (only relevant if the proposal to remove the schedule method does not proceed).
  • Require a framing fraction of no less than 38% to be assumed when determining the construction R-value of framed walls, unless a designer can demonstrate that a lower framing fraction is justified. Reduce the wall R-values across the six climate zones for the reference building of the calculation and modelling methods to avoid additional costs from the framing fraction change.
  • Require the areas of roofs, walls and floors to be measured using overall internal dimensions.
  • Modify the citation of NZS 4214 to calculate R-values.
  • Clarify requirements for establishing which of the H1 acceptable solutions and verification methods apply for mixed-use buildings and exclude the area of building parts that are classified as housing, industrial or communal-residential when determining the area of the building.
  • Expand the slab-on-ground floor performance tables in H1/AS2 Appendix F to cover more situations.
  • Update references to the latest editions of the BRANZ House Insulation Guide and AS/NZS4859.1.
  • Remove obsolete definitions and make other minor editorial changes to improve clarity and readability.

< 3.14. Topic 22: Acceptable Solution H1/AS2 and Verification Method H1/VM2 include obsolete provisions and definitions, and outdated references to documents and tools | 3.16. Transition period for large buildings H1/AS2 & H1/VM2 >

Crown copyright © 2024

https://www.mbie.govt.nz/building-and-energy/building/building-and-construction-consultations/consultation-document-insulation-requirements-in-housing-and-other-buildings/3-insulation-in-large-buildings/3-15-summary-of-the-proposals-for-large-buildings
Please note: This content will change over time and can go out of date.