A windshield crack can look unchanged for days, then grow after a cold night, a warm defroster, a rough road, or another small impact.
The crack is already a weak point in the glass. Normal conditions can place stress around that damaged area.
Temperature changes
Glass expands and contracts as temperature changes.
A cold windshield can be stressed by sudden heat. A hot windshield can react to rapid cooling. The effect is not always dramatic, but existing damage may respond to the change.
This is one reason a chip or short crack can grow during seasonal weather shifts.
Road vibration
Every trip exposes the vehicle to vibration.
Rough pavement, potholes, gravel roads, construction zones, and normal body movement can all affect damaged glass. A healthy windshield is designed to handle normal driving loads. A crack creates a weakened path where stress can travel.
Pressure around the edge
Damage near the edge of the windshield can be affected by the way the glass is mounted and supported.
A crack close to the edge may behave differently from damage nearer the centre. The exact location should be part of the assessment.
Another impact
A second stone strike or small impact can add stress to a windshield that is already damaged.
The new impact does not have to land directly on the existing crack to affect the glass.
Moisture and contamination
Dirt and moisture can enter damaged areas over time. This can make the condition more complicated and may affect the quality of a later repair.
Avoid pressing, picking, or applying unapproved products to the damage.
Vehicle body movement
Vehicles flex slightly during normal use. Driveways, uneven roads, lifting points, and temperature changes can all cause small movements.
A crack can react to those forces.
Repair may no longer be possible after spreading
A small, suitable chip may be repairable. Once a crack grows, the appropriate service may change.
This is why early assessment is helpful. It does not guarantee repair, but it gives the technician a chance to inspect the damage before it develops further.
What to do when you notice a crack
- Note where it begins and ends.
- Avoid pressing on the glass.
- Avoid sudden temperature changes where practical.
- Have the vehicle year, make, and model ready.
- Call a glass shop for an assessment.
Has your windshield damage started to spread?
Call Tony’s Glass Enterprises at 780-645-6013 and describe the current condition.