Weathertightness and durability design for school buildings

Weathertightness and durability requirements need to be met when designing or altering school buildings. As a board of trustees, you must make sure your project manager and designer are aware of these requirements and sign off processes.

Designing requirements for schools

When designing or altering a building, make sure your project manager and designer know about our Weathertightness and Durability Requirements. Our requirements set out our minimum standards for building construction, which is a higher standard than the Building Code. They:

  • define products that cannot be used on school building projects
  • list products that must be peer reviewed if used
  • include requirements to ensure the durability of certain materials when used in specific locations.

Weathertightness and Durability Requirements [PDF, 3 MB]

Process to have Ministry check designs

To ensure your design meets Ministry requirements, all designs affecting the building envelope that requires a Building Consent must be checked by a technical expert. Designs where consents are required may include new buildings, refurbishments projects including roof or cladding replacements, changing windows, new doors etc. 

A review of design is not required where there is no consent requirement e.g. like for like replacement of roofing material.

Depending on the nature of the project please follow one of the two processes below:

1. 5YA projects under $3m: Building Envelope Assessments

The Ministry will pay for these reviews to be undertaken. This service will not impact your 5YA project budget.

The process is as follows:


        • The Project Manager or designers are required to submit their plans to our Facility Compliance Contractor for assessment against the Ministry standard Weathertightness and Durability Requirement and the building code
        • Please submit the following information and documentation for assessment to
        • Submission Checklist
          Item no. 
           a.  General details including:
          • School Name
          • School Address
          • School ID
          • Project Name & detailed description of works
          • Ministry Project ID number
          • Design Company name
          • Name of Ministry Property Advisor
           b. Completed and signed Appendix A form [PDF, 288 KB]
           c. Sufficient specification, construction detailing and referencing of manufacturer’s technical literature to provide contractors with clear and adequate guidance on construction requirements for code compliant construction
           d. General arrangement drawings including site and building location, floor plans, elevations and roof plan with the scope of works identified

          Cross sections through the building envelope 

           f. For the proposed works, large scale details for all flashings, junctions, changes of plane and assembly details at 1:10, 1:5, or 1:2 scale as appropriate, and clearly cross referenced to the general arrangement drawings 
           g. 3D views of complex flashing junctions 
           h. Flashing details of any services penetrations through the external envelope 
           i. Project-specific specification, including proprietary products 
           j. Risk Matrix for E2 AS1 –  for all relevant roof elevations

If you are submitting this information via a Dropbox link or something similar, please make sure it only contains the above requested information.

Assessment and feedback 

          • The Facility Compliance Contractor will assess the plans and report back to the Project Manager/Designer
          • Any areas of concern will be listed and highlighted on the drawings. If any major concerns are identified, the appropriate Infrastructure Manager will be notified. Solutions to the concerns raised will need to be worked out between the Designer, Project Manager and overseen by the School's Property Advisor & Infrastructure Manager.

Amend highlighted concerns

          • There will not be a resubmission process
          • It is expected that any feedback or changes noted on the report will be taken into consideration and modifications to designs made as required.

2. Capital Works projects (and complex and significant 5YA projects over $3m)

The Project Manager is responsible for organising a weathertightness review from an independent and qualified professional supplier, at the cost of the project.

Prior to completion a project may be subject to a site audit. This will be done to check that any areas of concern have been rectified.

Weathertightness remediation projects

For buildings either built or modified from 1994 onwards the Ministry’s remediation programme will address any occurrences of weathertightness failure. However, all buildings will be dealt with on a case by case basis. Projects to remediate buildings within the programme are reviewed by the Ministry’s Weathertightness Review Panel.


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