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.
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|
A future amendment to NZS 4211:2008 is expected to include this solution.
Articles are correct at the time of publication but may have since become outdated.