g12

Acceptable Solutions and Verification Methods For New Zealand Building Code Clause G12 Water supplies

All content related to G12 Water supplies

3rd edition, amendment 14

Current version: Effective on 2 November 2024

3rd edition, amendment 13

Effective on 2 November 2023 until 1 November 2024

3rd edition, amendment 12

Effective on 27 June 2019 until 1 November 2024

3rd edition, amendment 11

Effective on 30 November 2018 until 31 October 2019

3rd edition, amendment 10

Effective on 1 January 2017 until 31 March 2019

Eight referenced Standards are updated to the latest versions and BS EN 1567:1999 is referenced. Minor corrections, clarifications and consequential changes from updating Standards are made to G12/AS1 and G12/AS2.

Cited content in this document can be found on the Building CodeHub website.

3rd edition, amendment 9

Effective on 14 February 2014 until 30 May 2017

All of the Acceptable Solutions and Verification Methods relating to G12 are contained in one document.

  • G12/VM1 provides a Verification Method for the design of water supply systems.
  • G12/AS1 applies to below and above ground piped water supply systems. It details cross connection hazards, backflow prevention, air gap separation, water tanks, flow rates and equipotential/earth bonding.  It includes hot water supply systems, climates subject to freezing and seismic restraint.
  • G12/AS2 applies to solar water heaters installed in or on buildings. 

3rd edition, amendment 8

Effective on 10 October 2011 until 14 August 2014

3rd edition, amendment 7

Effective on 30 September 2010 until 10 October 2011

3rd edition, unamended

Effective on 1 December 2007 until 30 June 2010

2nd edition, amendment 6

Effective on 23 June 2007 until 1 December 2007

2nd edition, amendment 5

Effective on 25 February 2004 until 23 June 2007

This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: