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Frequently Asked Questions
What is laminated glass?
Two or more panes bonded together.
A plastic interlayer sits between them.
Heat and pressure make the bond.
The assembly behaves as one pane.
Thicknesses and interlayers vary widely.
What happens when it breaks?
It cracks but holds together.
Fragments stay stuck to the interlayer.
The pane remains in the opening.
Nothing falls out.
That is the whole point of it.
Why is it required overhead?
Because falling glass is the hazard there.
Toughened glass overhead breaks into granules.
Those granules fall on people beneath.
Laminated stays in the frame.
Most codes require it for overhead glazing.
Why is it used in barriers?
A barrier must keep restraining after breaking.
People lean on balustrades.
A failed pane that falls out leaves an opening.
Laminated glass continues to restrain.
Toughened and laminated are often combined.
How does security glazing work?
The interlayer resists penetration.
Breaking the glass leaves a tough membrane.
That takes sustained effort to get through.
Thicker and multiple interlayers resist more.
Grades run up to ballistic resistance.
Can it be cut?
Yes, unlike toughened glass.
It is scored on both faces.
Then the interlayer is separated.
A glazier can work it on site.
That makes it far more forgiving.
What should be watched?
Moisture at exposed edges.
Long-term wetting can cause delamination.
A cloudy separation creeps in from the edge.
Seal or protect edges in wet locations.
Let the glazing rebate drain.