While some chips and cracks can be repaired safely, there are situations where replacement is the only option. Knowing when your windshield must be replaced protects your safety and ensures your vehicle meets legal standards
Cracks Longer Than 6 Inches
One of the most common reasons for replacement is the length of the crack. Most professionals agree that cracks over 6 inches compromise the strength of the glass and can’t be repaired reliably. These long cracks are more likely to spread without warning, especially during temperature changes or heavy vibrations.
According to NHTSA guidelines, damage beyond certain limits requires full replacement to maintain crash safety performance.
Edge Cracks and Structural Concerns
Cracks that reach the edge of the windshield are particularly dangerous. The glass edge bonds to the vehicle’s frame, helping support the roof in a rollover. Edge cracks weaken this bond, increasing the risk of ejection in an accident. Even if an edge crack starts small, it can grow quickly and lead to sudden failure.
Transport Canada emphasizes that structural integrity is critical for occupant protection. You can learn more about vehicle glazing standards in their defect investigations.
Multiple Impact Points
When your windshield has more than one chip or crack, repair becomes less effective. Multiple impact points can weaken the entire glass surface, making it prone to further damage. Even if each crack alone might be repairable, the combined stress usually requires replacement.
Damage in the Driver’s Critical View Area
If a crack or chip falls within the driver’s primary field of vision, repair may leave a minor distortion. This can interfere with visibility and create glare, making driving unsafe. In these cases, most insurance companies and repair professionals recommend a full replacement to restore clear sightlines.
At Speers Auto Glass, we always prioritize safety. If we find that a repair could impair your vision, we’ll recommend our windshield replacement services.
The Replacement Process and Safety Benefits
Windshield replacement involves carefully removing the damaged glass, cleaning the bonding surface, and installing a new OEM-quality windshield with fresh adhesive. The adhesive cures to form a strong seal that restores the structural strength and prevents leaks.
If your vehicle includes features like ADAS sensors or rain detection, they will be recalibrated to work properly with the new glass. We cover this entire process at Speers Auto Glass, ensuring your replacement meets all manufacturer and safety standards.
If your windshield damage meets any of these criteria, don’t wait—contact Speers Auto Glass today to schedule your replacement and protect your safety on the road.
Related Posts in This Series
- When Can Auto Glass Be Repaired?
- DIY vs Professional Glass Repair: What You Need to Know
- How Much Does Auto Glass Replacement Cost?