Effects of Stress on Windshield Chips and Cracks

As the auto glass experts, it is our job to conduct and share industry-leading research to understand how glass damage could impact you. In a recent windshield damage study, we learned that stressors like extreme temperatures, driving and fatigue will cause existing windshield chips and cracks to spread quickly.

Cold weather stress

In cold weather conditions, windshields will develop a more concave shape. As a result, windshield chips and dings are more likely to spread in a horizontal fashion. According to a study conducted by the Motor Industry Research Association (MIRA), chips were likely to spread more than 80 percent of the time at temperatures of 14 degrees (-10° C). Those tested at 32 degrees were nearly 60 percent likely to crack.

Warm weather stress

Warm weather conditions cause windshields chips to spread more vertically. The same study conducted by MIRA suggested that the heat itself distorts the shape of the windshield glass, which can lead to cracking by itself. However, it was also found that the cooling effect of the air conditioning unit is likely to set off a crack.

Driving and fatigue stress

Driving over a speed bump, pothole or other uneven terrain can cause a chip to crack. The force radiates through the car and puts additional pressure on the edges of the chip, which can quickly lead to a crack.

Although it is not possible to suggest how long it will take for a chip to spread, the study suggests that stressors like weather changes and simple driving will eventually cause or lengthen a windshield crack.

Getting a windshield repair early can stop the damage from spreading and prevent the need for a windshield replacement.