Tempered and Laminated Safety Glass
CSI Division 08, Openings
Two different types of safety glass: tempered glass is heat-treated so that if it breaks, it shatters into small, relatively harmless pieces instead of large sharp shards, while laminated glass bonds two glass layers around a plastic interlayer so that even if it breaks, the pieces stay held together rather than falling away.
Why it matters
Code requires safety glass in specific hazardous locations, like doors and low windows, precisely because ordinary glass breaks into dangerous shards. Tempered and laminated glass solve that problem in different ways, and a project specifies the right one based on the actual application, since they're not interchangeable: laminated glass, for instance, is also used where keeping broken glass in place matters, like overhead glazing.
On a real project
A glazier installs tempered glass in a storefront door, a code-required hazardous location, while a separate overhead skylight on the same project uses laminated glass instead, since the design calls for broken glass to stay held in place rather than fall through if it's ever damaged.
Who this matters most to
A Glazier installs the specific safety glass type a location requires, confirming it matches the design and code requirement for that exact spot rather than treating all safety glass as interchangeable.
Where this goes wrong
A glazier installs standard annealed glass in a code-required hazardous location, rather than tempered or laminated safety glass, either by mistake or because the correct material wasn't on hand. The substitution isn't caught until a final inspection specifically checks glazing type at hazardous locations.