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UPDATES TO NZS 4211:2008 – Specification for performance of windows

Newly released Technical Specification SNZ TS 4211:2022 – Specification for the classification of windows has been released to supersede NZS 4211:2008. The main change in the new Specification includes window classification for a wider range of building typologies from buildings within the scope of NZS 3604 and EM7, to buildings in SED zones. The test procedure for a 2022 (A) classification includes provisions for ‘lite’ seismic testing (defined as in-plane lateral displacement) which is more closely aligned with the test procedures in AS/NZS 4284:2008 and EM7. The Specification also includes expanded scope for air permeability classification, refining the previous pass/fail criteria to a Class 1 to Class 4 classification.

In line with NZS 4211:2008, SNZ TS 4211:2021 continues to omit testing of the glazing to facade junction, which includes testing of the ‘wet’ side of the reveals and mitre joints. Weathertightness of these junctions and joints therefore continues to be the responsibility of the designer if NZS/SNZ TS 4211 test reports are relied on for NZBC E2 compliance of the joinery systems.

KEL provides specialist design of all building envelope junctions and transitions, including design of joinery system integrations where NZS/SNZ TS 4211 test reports are used for NZBC E2 compliance.

The full SNZ TS 4211:2022 Technical Specification can currently be downloaded for free below:

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