The Glazing Of IGUs

This Industry Best Practice Guide (pdf) provides requirements, information and guidance, to designers, suppliers, and glaziers of IGU’s, in New Zealand. It refers to the glazing of IGU’s and includes agreed best trade practices used by the Associations members over many years.

Double Glazing Manufacturers

IGUMA (Insulating Glass Unit Manufacturers Alliance) is a group of Glass Processors who have agreed to an (independently verified) testing regime.  Your IGUMA Member supplier can provide you with a copy of the current compliance certificate for the product you are purchasing.

NZS4223.2:2016 requires IGU to be tested and demonstrate compliance.  IGUMA members who comply with IGUMA-BS EN1279 testing also comply with the requirements of Section 5 of NZS 4223.2:2016.  Paragraph 5.1.3 of the standard refers to the “Acceptable period between tests” and requires compliance testing to be conducted at least every two years.

Identification of Insulating Glass Units

The New Zealand Building Code Clause B2 (amendment 9, January 2017) modifies NZS 4223 Part 2 as follows:

5.3 Marking

Insulating glass units shall be permanently and clearly marked. As a minimum, marking shall include the following:

a) The name or registered trademark of the manufacturer or supplier;

b) The date of manufacture (use the year as the minimum), and

c) Complies with NZS 4223.2:2016.

Marking shall be visible after the IGU has been installed, and must be legible and durable for the life of the unit.

NOTE:

• Etching and permanent laser marking are acceptable means for marking insulating glass units.  Externally affixed adhesive labels are not acceptable.
• Additional Marking may be used by the manufacturer.