NZS 3604:2011 introduced an extra high wind zone based on a maximum site wind speed of 55 m/s, while NZS 4211:2008 introduced an extreme wind zone based on a maximum wind speed of 60 m/s.
Interim solution
A set of test pressures has been calculated for NZS 4211:2008 based on the new extra high wind speed used in NZS 3604:2011 and in the revised E2/VM1. The pressures (see Table 1) can simply be added to NZS 4211:2008 Tables 1, 4 and 5.
Windows with an extra high rating will then be able to be used in locations with a site wind speed up to 55 m/s, which aligns with NZS 3604:2011.
Extreme wind zone
Windows can be rated to perform in the extreme wind zone in NZS 4211:2008 (which applies to locations where the site wind speed is between 55 and 60 m/s), but the claddings and installation details must be the subject of specific design.
| Table 1 | SLS test pressures | Extra high | ±1,515 Pa |
| Table 4 | Water test pressures | Extra high | 455 Pa |
| Table 5 | ULS test pressures | Extra high | ±2,130 Pa |
Note
A future amendment to NZS 4211:2008 is expected to include this solution.
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