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 Green Star Technical Clarification Rulings

Technical Clarifications for Green Star represent our answers to Technical Questions submitted by projects, and provide further guidance and reference to others. The list is regularly updated.  

There are two types of Technical Clarifications listed in the table below:

General Clarifications

These are extensions to the guidance provided in the Submission Guidelines. They clarify and sometimes supersede the original Credit Criteria or 
Compliance Requirements. General Clarifications set precedent for future project teams to follow. Should a project team wish to apply a general clarification to its project, there is no requirement for further Technical Questions to be submitted. NZGBC Assessors will also use them as precedents to assess submissions.

Project Specific Clarifications

These are published as references for other projects but, unlike General Clarifications, they do not set precedent. They often relate to special 
situations where multiple prerequisites exist for a particular project and are less likely to reoccur to another project. Therefore, rulings set for Project Specific Clarifications are often conditional and will likely vary for other projects. Each project still needs to submit its own Technical Questions and provides evidence relating to its own building in order to have a similar ruling approved for that specific building. 

Should you wish to apply any Technical Clarification for legacy rating tools to your projects, please submit a Technical Question to the NZGBC to 
explain why and how it applies. You can download the Technical Question form here

How to most efficiently use this page:

  1. Filter for the relevant tool version
  2. If known, use the credit name field to search for credit keywords or corresponding credit number - please note, this field will ONLY search the "Credit Name" field
  3. Use your CTRL+F to search keywords on the page
Technical Question Title Clarification Type Tool Version Month Released Credit Name Sub-credit Name Amendment/Approved Ruling
Definition of "Minor Local Contamination" General DABv1 August 2021 24 - Sustainable Sites Contamination and Hazardous Materials

For the sake of clarity, "minor local contamination" should be interpreted as contamination that would not trigger soil remediation under the National Environmental Standard for Assessing and Managing Contaminants in Soil.

Drop-off Lanes/Spaces General DABv1 May 2021 17 - Sustainable Transport Sustainable Transport

Where drop-off lanes/spaces are provided, these can be excluded in the total number of car parks used to demonstrate compliance.

In order to be excluded, drop-off spaces on the drawings submitted must show that the spaces/lanes are marked to indicate “no stopping at all times” (or similar) and the design should clearly indicate they are drop-off lanes rather than car parks.

Walking School Buses General DABv1 May 2021 17 - Sustainable Transport Sustainable Transport

Walking School Buses are eligible for points under the Private Mass Transport component of this credit. However, the Walking School Bus service must meet the catchment, frequency and contractual requirements set out in the Technical Manual in order to be awarded any points.

Reduction of Carparks General DABv1 March 2021 17 - Sustainable Transport Reduced Car Parking Provision

Projects that reduce the existing number of carparks (net total) on existing campuses (while also providing new carparks) also meet the credit criteria.

Model Daylight for Floorplates General DABv1 April 2022 12 - Visual Comfort Daylight

A project may use a sample approach to model daylight for ascending uniform floorplates for the purpose of demonstrating compliance where: 

  • Each distinct floor plate is modelled in totality. 
  • Each distinct floorplate is modelled at the lowest possible opportunity.

The approach is allowed where: 

  • No recognised surrounding infrastructure or landform that would influence daylight of a higher level.
  • Ascending floorplates have uniform floor plans, orientation, material composition, arrangement, and spatial relationship to overshadowing buildings or features. 

Documentation Requirements: 

Please provide the following in your submission: 

  • Architectural drawings of typical floor plates
  • Evidence demonstrating there is no surrounding infrastructure capable of influencing daylight
  • A copy of this response

All other requirements are as per the submission guidelines. 

LCA Credit Targeting - use Reference Building Guidance in section 8.2 General DABv1.1 July 2023 19 - Life Cycle Assessment/Impacts Comparative Life Cycle Assessment

All projects targeting the LCA credit under both versions of Design & As Built NZv1.0 (credit 19A.1) and v1.1 (credit 19.2) should use the reference building guidance located in section 8.2 of the Green Star NZ Embodied Carbon Methodology. This section should provide guidance on materials and typology often referenced in relation to LCA. Where projects are following this guidance for the reference building, please make this clear in the submission template comment box.

Highest Level of Filtration in FCU is G2 General DABv1, DABv1.1 December 2022 9 - Indoor Air Quality Ventilation System Attributes

Where the highest level of filtration possible in the FCU is G2, i.e. in smaller FCUs, and only access downstream of the heating/cooling coils is possible then:

  • Adequate access must be provided to the FCU for filter cleaning/maintenance/replacement.
  • Adequate access must be provided to the downstream side of the heating/cooling coils in the FCU for cleaning/maintenance.
  • Adequate access is considered as that presented in item B on the bottom of page 116 of the Submission Guidelines, ensuring that access to the filter is also adequate.
  • Outdoor air must be supplied to the FCU via an air handling unit (AHU).
  • AHU must have minimum levels of filtrations of: Panel filter = G4 + Deep Bag = F7 (ePM1 50%). An additional panel filter is recommended to extend the clean performance of the bag filter.
  • Adequate access to both sides of the AHU coils for cleaning/maintenance must be achieved.
  • The building owner commits to a maintenance schedule that includes regular filter and coil inspections/cleans as necessary.  The regularity of maintenance should be based on the manufacturer’s recommendations.

Project teams wishing to use this approach should include evidence of the following in their submission:

  • Why filtration no higher than G2 is possible at the FCU.
  • Accessibility at the FCU is adequate for both filter maintenance/replacement and coil inspection/cleaning.
  • A maintenance plan clearly showing the requirements for filter and coil maintenance have been met.
  • A commitment from the building owner for implementing the maintenance plan as proposed.
Revision of Credit 25 General DABv1 July 2020 25 - Stormwater Stormwater

 Credit 25. Stormwater in Green Star Design & As-Built has been updated. The revised credit shall be used for Green Star projects and it supersedes the previous revision published in March 2020

The updates are based on the feedback that NZGBC received following the release of the previous updates and in-depth consultation with industrial professionals. Changes in the revised Stormwater credit include:
- Change from 'dissolved' Zinc and Copper to 'total' Zinc and Copper under table 25.1 Pollution Reduction Targets.
- Incorporation of a technical clarification issued in April 2020 which allows the Zinc and Copper to be excluded from modelling when proper source control methods are available. 

Office Spaces in Lighting Comfort General DABv1 October 2019 11 - Lighting Comfort General Illuminance and Glare Reduction

The guidance reference for 'Office Spaces' in the Lighting Comfort - General Illuminance and Glare Reduction credit criterion is updated to Table E1 of AS/NZS 1680.2.2:2008 'Interior and workplace lighting Part 2.2: Specific applications - Office and screen-based tasks'.

CarboNZero for Building Operations General DABv1 September 2021 5 - Commitment to Performance Environmental Building Performance

Given that the CarboNZero for Building Operations certification for buildings requires energy and water efficiency intrinsically through buildings’ performance stages, it is acceptable for project teams to show commitment to the CarboNZero for Building Operations instead of a Green Star Performance rating to achieve the point for 5.1 Environmental Building Performance. This pathway may only be used for projects that have been registered for a CarboNZero certification or have shown formal commitment through formal agreements or policies.