Installation Damage
While glass is being moved and installed, it is easy for the glaziers to nick or chip the edges of the glass with various tools. It is also possible for fasteners such as nails or screws which are used to attach glass stops to nick the glass edges if these fasteners are installed at an improper angle. These small nicks or chips may not result in immediate breakage. However, over time, as the glass expands and contracts, stress concentrations can develop around the nick that break the entire unit. In the case of tempered glass the entire unit usually breaks.
Read more about this topic: Spontaneous Glass Breakage
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