A facility asked to harden its ground-floor windows without turning them into prison slots. The answer was a bullet resistant window: a transparent ballistic polycarbonate panel retrofitted behind the existing opening, keeping daylight and sightlines while stopping the threat. Retrofitting is cheaper and faster than rebuilding, but only if the panel and frame are designed together.
How a ballistic window retrofit works
The polycarbonate panel is sized to the opening, machined to the frame’s edge detail, and fixed through a continuous restraint so the impact load spreads rather than concentrating at a bolt. Because polycarbonate is far lighter than laminated glass at equal protection, the existing frame often carries it without reinforcement. The panel stays clear, so the room keeps its daylight and the sightlines.
What to specify for a secure window
- Threat level: confirm the UL 752 level the window must stop.
- Panel size and thickness: sized to the opening and the level, with lamination where the threat demands it.
- Frame interface: the panel edge detail cut to your frame so the load transfers evenly.
- Fixing: continuous restraint, not point bolts that become weak spots.
- Clearance for daylight: keep the transparency so the retrofit does not darken the space.
For the composite build and edge logic, see glass clad polycarbonate glazing and the level selection in how to choose a UL 752 level.
Frequently Asked Questions
Q: Can a bullet resistant window be fitted to an existing frame?
A: Often yes, because polycarbonate is lighter than laminated glass at equal protection; confirm the frame can carry the panel and the fixing transfers load evenly.
Q: Will a ballistic window block the light?
A: No, properly laminated polycarbonate keeps good transparency, so the window retains daylight and sightlines while providing protection.
For a project-specific quotation on bullet resistant polycarbonate, email oversales@rpplexiglass.com with your threat level, panel size and frame detail.