Auto Glass Tips « NIS Glass New Zealand

By: Nis Glass  06-Dec-2011
Keywords: Glass, Windscreens, Auto Glass

Auto Glass Tips « NIS Glass New Zealand

Not all cracks are created equal. Your windshield damage may require a full replacement or may be fixed by a simple repair.

Sometimes though, the type, size and position of the damage will mean that the whole windscreen needs to be replaced.

Take a quick look at our simple guide to whether it will be possible to repair your existing windscreen or whether it will need to be replaced.


There is an Australian/New Zealand standard for windscreen repairs (AS/NZ 2366:1999). The standard allows repairs depending on where the damage is.

One area of the windscreen is called the Critical Vision Area (CVA) and repairs are limited in this area. The CVA starts 65mm from the bottom of the windscreen in line with the centre of the driver’s headrest. It extends 150mm on either side of that centre line and continues to 90mm from the top of the windscreen. Repairs can be carried out if the damage is no larger than:

Type of damage

Inside CVA area

Outside CVA area

Crack 25mm 350mm
Star 15mm 30mm
Horseshoe 10mm 25mm
Bullseye 10mm 20mm
Crater 2mm 5mm

The size of the damage refers to the diameter of a circle drawn around the outer extremities of the damage. The standard also prohibits repairs if:

  • A crack starts and finishes at the edge of the windscreen.
  • The damage affects more than the outer layer of glass.
  • The windscreen bonding layer has deteriorated.
  • There are eight or more repairs on the windscreen.
  • There is a previous repaired crack over 100mm.
  • Two or more previous repairs are in the Critical Vision Area and the new damage is in the CVA.
  • An adjacent previous repair is in the overlay area (the overlay is a tool used to assess damage to windscreens) and the new damage or previous repair is in the CVA.

Keywords: Auto Glass, Glass, Windscreens

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