Balustrade glass: toughened, laminated, and thickness.

All balustrade glass is safety glass, but not all safety glass is the same. The difference between toughened and laminated, and between 10mm and 12mm, is not marketing. It decides how the panel behaves on the worst day of its life, and AS 1288 is specific about which situations need which glass.

Toughened: strong, and it crumbles safely

Toughened (tempered) glass is heat-treated so it is several times stronger than ordinary glass, and when it does break it crumbles into small blunt pieces instead of shards. It is the standard for most balustrade panels: 10mm for many framed and semi-frameless systems, 12mm where the spans and loads step up, which includes most frameless spigot-fixed work.

Laminated: it breaks, but it stays put

Laminated glass is two sheets bonded to an interlayer. Crack it and the panel holds together, hanging in place rather than leaving a hole in the barrier. That behaviour is why the standard calls for laminated (or toughened-laminated) panels in situations where a missing panel would be dangerous: frameless balustrades without a continuous top rail, and elevated positions where glass falling to the space below is a real hazard.

The top rail changes the spec

A detail most people have never had a reason to know: on a frameless glass balustrade, the presence or absence of a continuous handrail changes the glass requirement. With an interlinking rail, a broken panel's job can be shared by its neighbours, so toughened glass may be acceptable. Without one, each panel stands alone and generally needs to be laminated so it stays in place when broken. It is one of the first things we check when someone asks for the "clean, no rail" look.

Balustrade glass is not shower-screen glass

The panels look similar; the duty is different. A balustrade is a fall barrier carrying engineered loads under AS 1170, and its glass is specified under AS 1288 for that duty, edge-worked and fixed accordingly. Buying panels meant for a shower screen or a pool fence and putting them on a balcony edge is how bargain jobs fail certification.

What this means for your job

You do not need to memorise the standard. Tell us where the balustrade is going and what look you want, and we specify the glass type, thickness and fixing that make it compliant, then put it in writing with the quote.