AMENDMENTS TO NZS 4211
Most metal windows and doors are tested to NZS 4211: 2008 to comply with NZBC B1/VM1, NZBC E2/VM1 and NZBC E2/AS1. On the other hand, only some timber windows and doors are tested to NZS 4211, non-tested ones are an alternative solution.
Amendment 1 of NZS 4211: 2008 Specification for Performance of Windows has brought it into line with NZS 3604 in terms of wind zones. What this means is that for non-specific design buildings to NZS 3604 (or NZS 4229), all the specifier has to do is list the wind zone to NZS 3604 from Low (L) to Extra High (EH). The complying manufacturer will usually have had their doors and windows tested to NZS 4211 for those wind zones, and they must mark the frame with the following:
The scope of NZS 4211, table 6 includes an "Extreme" wind zone, this allows specific design with wind pressures beyond NZS 3604 to maximum of 2500 Pa (ULS). Be careful, because NZS 4211 only tests the window not the installation into the wall. So a windows performance for wind pressures higher than NZS 3604 may comply with NZBC E2/AS1, but the installation may have to be an Alternative Solution as the installation is subject to the scope of NZBC E2/AS1.
- Manufacturer's name or brand name.
- NZS 4211:2008
- Wind zone or wind pressure rating (ULS pressures for specific design)
- Air infiltration level
NZS 4211 essentially is a Standard that defines the tests for doors and windows and their relative performance such as:
Although the Building Code does not yet cite Amendment 1, the amendments alignment with NZS 3604 makes it more consistent with, the Acceptable Solutions and many other Standards. It also makes it less confusing for projects in the Extra High wind zone, as they are now distinct from the Extreme wind zone. As it will make no difference to actual performance, Masterspec have based section changes on the Amendment 1 version.
- Deflection under SLS wind pressures
- Maximum force required to open a sash.
- Air infiltration for air conditioned or non-air condition spaces.
- Water penetration under defined wind pressures.
- Collapse under ULS wind pressures.
- Torsional strength of sashes
This amendment has only meant a very small change to most of the Masterspec door and window sections. However, the timber door and window sections have had slightly more changes to take account of the growing number of timber doors and windows being tested to NZS 4211.