Why a Windscreen Crack Can’t Be Repaired

When you notice a crack in your windscreen, it’s only natural to wonder if it can be repaired or if you’ll need to invest in a full windscreen replacement. While it is true that some chips can be fixed, sadly cracks cannot, and cracked glass must be replaced. In this blog post, we’ll explain what cracks are why they can’t be fixed.

What Are Windscreen Cracks?

A windscreen crack is a break in the glass that can occur due to a variety of reasons, from a small pebble hitting the glass to extreme temperature changes. Unlike chips, which are often small and shallow, cracks are more serious and indicate deeper damage to the structure of your windscreen. They can appear as a simple line or a more complex, spider web like network of fractures.

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How Are Windscreen Cracks Caused?

Windscreen cracks can be caused by several factors. One of the most common causes is flying debris from other vehicles on the road. A small stone or piece of gravel can strike your windscreen with considerable force, causing a crack to form. Temperature fluctuations can also play a role; when the windscreen cools down rapidly or is heated up quickly, the glass naturally expands or contracts accordingly, which can result in stress fractures especially if a pre-existing chip is present. Other common causes of windscreen cracks include; poor installation and manufacturing defects.

Types of Windscreen Cracks

Windscreen cracks come in different shapes and sizes. The most common types include:

• Edge Cracks: These cracks form near the edge of the windscreen and can spread rapidly. They are usually a sign of structural weakness.
• Star Cracks: These cracks resemble a starburst pattern with several spokes radiating from the centre. They are typically caused by an impact, such as a stone hitting the windscreen.
• Bullseye Cracks: A round crack with a smooth, circular appearance. It’s often caused by a small, blunt object striking the glass.
• Long Cracks: These cracks can stretch across the entire windscreen. They’re usually caused by temperature fluctuations or a significant impact.

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How a Crack Affects a Windscreen

A crack in your windscreen can compromise the integrity of the glass which is not to be taken lightly. Windscreens are designed to provide structural support to the car and protect you and your passengers in the event of a collision. When a crack appears, it weakens the glass and will affect its ability to withstand pressure. A cracked windscreen can make it easier for the glass to shatter under stress, drastically reducing the safety of your vehicle. Cracks can also distort your vision, particularly if they’re near the driver’s line of sight, making driving dangerous.

Why Can’t a Windscreen Crack Be Repaired?

While it is possible to repair certain windscreen chips, cracks cannot be repaired and will require a total windscreen replacement. This is because once a crack has formed, in effect all layers within the windscreen are compromised to such an extent that the glass is beyond salvage. Even attempting to repair a crack runs the risk of further affecting the windscreen’s structural integrity and warping the glass, not only distorting the driver’s view but rendering the windscreen inoperable as a vital car safety component.

While it may be tempting to try and fix a crack in the windscreen, don’t! Even if a DIY kit seems like an easy solution, it’s by no means a guaranteed fix for a larger more complicated crack and will only serve to worsen the issue.

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Why Windscreen Cracks Are Dangerous

Driving with a cracked windscreen can be extremely dangerous. A cracked windscreen can affect your visibility, especially if the crack obstructs your view while driving. This is particularly risky in adverse weather conditions, such as rain or fog where your vision is already impaired. Furthermore, a cracked windscreen can increase the risk of the glass shattering upon impact, as the crack weakens the overall structure of the windscreen.

In the event of a collision, a cracked, chipped or otherwise compromised windscreen may not provide the necessary protection for passengers. Windscreens help to prevent the airbags from deploying incorrectly and maintain the structural integrity of the car. If the windscreen is cracked, it may not absorb shock properly, putting you and your passengers at a much higher risk of sustaining an injury or worse in the unfortunate event of a collision on the roads.

In essence, while small chips or shallow cracks in your windscreen may feel like only a minor issue, it is always wise to turn to a professional for assistance before the situation worsens. Always keep in mind, driving with a cracked windscreen is not just a cosmetic issue – it’s a safety concern. So, if you’re asking yourself, “how do I fix a crack in my windscreen?” – the sensible answer is usually “I don’t!”. Schedule an appointment with one our expert technicians and they will be more than happy to advise you how best to deal with any and all car glass issues or concerns.

 

Check back with the Autoglass® blog again soon for more explainers, guides and motoring tips to keep you and yours safe on the roads this holiday season.