Brace Large Windows

Glass windows typically crack or shatter when the frames are distorted or damaged. The principle causes of glass breakage are window frame distortion and inadequate edge clearance around the glass. Stiffening bracing or redesigning of the window frame can reduce future damage. Bracing usually consists of steel tie rods anchored to the corners of the window frame and connected by a turnbuckle. Another method is to use specially designed windows that use wider frames and include a compressible material between the frame and the window glass to avoid direct contact between the window and the frame. 

Effectiveness:

• Somewhat to very effective.

Limitations:

• Effectiveness limited by amount of bracing and size of the glass panels. 

Strengthen Window Glass

During an earthquake, window frames can experience extreme shaking or distortions that trigger glass breakage. Tempered glass is stronger than conventional glass and breaks into smaller, less dangerous fragments. Wire-reinforced glass, or adhesive film applied to existing windows, can hold the glass fragments together, reducing damage and falling hazards.

Effectiveness:

• Somewhat to very effective, and particularly effective for smaller windows.

Limitations:

• Effectiveness limited by structural framing and the size of glass panels.