NZS 4223.3:2016 - Change Affects Glazing in Buildings
28 Acceptable Solutions and 10 Verification Methods for complying with the NZ Building Code have been amended and took effect from 1 January 2017.
Among these has been the citing of NZS4223:2016 Glazing in buildings.
- Part 2: Insulating glass units
- Part 3: Human impact safety requirements
The following describes which version of an Acceptable Solution or Verification Method to use when submitting a complete application for a building consent:
- Until 31 December 2016: Use the existing version.
- From 1 January to 30 May 2017: Use either the existing version or the newly published version (during this transition period either version is an Acceptable Solution or Verification Method).
- From 31 May 2017: Use the newly published version (the existing version is no longer an Acceptable Solution or Verification Method).
This change in glass standards is very significant and will impact the cost of joinery to the builder or end customer. For example a typical 200sqm house with 20 units expect an approximate increase of around 10%.
- Biggest price affect is with sliding doors, particularly ones with vision rails as max IGU now 0.75sqm (30%-40%)
- Affects significantly windows below 800mm and above 500mm of the floor (>50%)
- Sidelights to doors
Highlighted below are examples of the main areas affected by the changes.
Talk to your local Fletcher Window and Door Systems supplier to discuss possible ways to get pricing down on windows and doors under the new standard.
Anything within 2m from floor level within 1m horizontally or anything within 2m horizontally of the bottom riser of each flight of stairs use Safety Glass.
Doors and Slidelights
For doors, annealed glass can be used up to 0.5m2 single glazed, or 0.75m2 double glazed. Over these sizes use safety glass.
All Bathroom/ Ensuite /Spa Room doors must use safety glass.
For side panels, annealed glass can be used up to 0.5m2 single glazed, or 0.75m2 double glazed. Over these sizes use safety glass.
Low Level Glazing
The height is now 800mm from floor level increased from 500mm.
This also affects other areas such as Unimpeded Path of Travel, Glazing Safeguarding a Fall and Window Seats.
Anything within 800mm of a window seat needs to be safety glass.
Safeguarding a Fall
Use safety glass when the lowest point of glazing is within 800mm from floor level.
- The height you are required to use safety glass in a Residential situation has changed from 700mm to 800mm
- From floor level it has changed from between 700mm - 1000mm to 800mm - 1000mm
- Any glass above 1m from the floor level will but within 2m from the floor level with no"special conditions" can typically use annealed (breaks into shards of glass)
For glazing within 2m use safety glass (this is one of the clauses that could be amended in the review).
Toilet Rooms (w/c’s) are not considered Bathrooms.
Pools & Spas
The glass required has not changed, but where it is required has. Therefore any glass winthin 2m horizontally and 2m vertically needs to be safety glass.
Minimum standard is toughened glass.