What causes windshield cracks?

Windshield cracks typically begin when a small chip or impact weakens the outer layer of the glass. Over time, stress on the windshield can cause that damage to spread into a longer crack.

Because windshields are made from laminated safety glass, the outer layer can crack while the inner layer remains intact.

Common causes include:

• Road debris striking the windshield
• Existing chips spreading over time
• Temperature changes causing the glass to expand or contract
• Vehicle vibration while driving
• Structural stress from the vehicle body

Once a crack forms, it will usually continue to spread if left untreated.

Why crack repair or assessment is important

Long cracks can affect the strength and safety of the windshield. In many cases, cracks cannot be repaired the same way small chips can and may require windshield replacement.

Having the damage assessed early helps determine the safest and most cost-effective solution.

Benefits of assessing windshield cracks early:

• Prevents the damage from spreading further
• Helps determine whether repair or replacement is needed
• Maintains structural safety of the windshield
• Prevents visibility issues while driving

Some shorter cracks may be repairable depending on their location, depth, and age.

How our crack repair or assessment process works

Our process focuses on evaluating the damage and recommending the safest option for your windshield.

Step 1 — Damage inspection
We examine the crack to determine its size, location, and whether repair is possible.

Step 2 — Cleaning the damaged area
If repair is possible, the area around the crack is cleaned to remove debris and air pockets.

Step 3 — Preparing the crack
In some cases, the ends of the crack may be stabilized to help prevent further spreading before resin is applied.

Step 4 — Resin injection
A professional-grade resin may be injected into the crack to reinforce the damaged section of the glass.

Step 5 — UV curing
The resin is hardened using ultraviolet light to bond with the glass.

Step 6 — Polishing
The repaired area is smoothed to improve clarity.

The primary goal of crack repair is to stabilize the damage and prevent it from spreading further. While the appearance of the crack may improve, cosmetic clarity is not guaranteed and varies depending on the length and condition of the crack.

If the crack is too large or located in a critical area of the windshield, replacement may be recommended instead.

Mobile crack assessment

If you're unsure whether your windshield crack can be repaired, you can submit a free damage assessment directly through our main page.

Simply upload a photo of the damage and provide a few details about your vehicle. There is no obligation to proceed with service.

Once your assessment is submitted, a technician will review the damage and reach out within about an hour with a verdict on whether the crack can be safely repaired or if replacement may be recommended.

This quick review helps you understand your options before scheduling any repair.