It is a situation that many drivers dread. You are cruising smoothly down the highway when you suddenly hear a sharp smack. You look up only to find a fresh, spiderweb-shaped crack staring right back at you.

Windscreen damage is incredibly frustrating and can completely ruin your day, but the reason behind that sudden crack might not be as random as you think. So, let’s look at five common factors that cause windscreen cracks, alongside simple ways to prevent them.

1. Stones and Road Debris

Loose gravel and stray pebbles are arguably the main culprits behind windscreen damage. This usually happens when you are driving behind large trucks or lorries carrying construction materials. These heavy vehicles can easily kick up loose stones from the road surface, launching them directly into your path.

Because you are moving fast, the impact of even a tiny pebble carries immense force. When that sharp stone hits your windscreen, it creates a small chip or fracture. Left ignored, this minor damage is highly likely to spread into a massive crack later on.

To lower your risk, keep a safe distance from heavy vehicles, especially on major multi-lane routes. Maintaining this extra space gives you much more time to react if any debris falls off the back of the vehicle. If you notice a lorry explicitly carrying loose sand or stones, it is also wise to change lanes safely so you are no longer driving directly behind them.

2. Intense Heat and Temperature Shifts

We all know how punishing the Malaysian sun can be, especially during afternoon heatwaves. When your vehicle sits exposed to direct sunlight in an open lot, the windscreen absorbs intense heat.

A stress crack can potentially occur when the windscreen experiences rapid temperature fluctuations. A common trigger for this is parking in direct sunlight and then immediately blasting the air conditioner on high. The sudden shift between the baking outdoor heat and the cold indoor air creates quick tension across the surface. If there is already an unnoticed microfracture or weak spot, this sudden change can be enough to cause it to split open. To help prevent this, try to park in shaded areas whenever possible 

3. Parking Under Trees

Finding a shaded spot under a leafy tree feels like a massive win when you want to keep your car cool. However, parking under large trees can expose your vehicle to unexpected dangers, especially during sudden, heavy storms.

Strong winds can easily snap old branches and heavy twigs, sending them crashing down directly onto your front glass. Even if there are no broken branches, certain trees drop hard, heavy fruits or large seed pods that can easily crack a windscreen when falling from a significant height. Even a seemingly small branch can cause severe structural damage when dropping from a significant height

While shade is helpful, it is important to inspect the tree before you walk away from your car. Avoid parking directly under branches that look dead, dry, or unstable. If heavy storms are expected, it is always safer to park your vehicle in an indoor parking lot or a multi-storey building from the start.

4. Poor Workshop Installation

A cracked windscreen could actually stem from a previous replacement job that was not done quite right. If the glass was not installed accurately, it might fail to sit correctly within the vehicle’s frame.

Because your car is constantly in motion, a misaligned windscreen constantly faces uneven pressure across its surface. Over time, this extra strain could cause cracks to develop near the edges of the glass completely on its own, even if nothing actually hits your car.

That is why choosing a reputable workshop with experienced technicians is so important. A professional installation helps ensure the glass is fitted properly so it can handle daily road conditions safely.

5. Minor Accidents

Collisions can easily cause your windscreen to crack, even if it never actually hits anything. If you get into a minor fender bender, bump your bumper, or accidentally hit a deep curb, the sudden jolt can travel right through the vehicle.

If the windscreen already has an unnoticed chip or a weak spot, that quick shake can be enough to force it to split open completely. Because of this, it is always a wise habit to closely check your windscreen for any fresh hairline fractures for a few days following any minor mishap.

Need a touch up for a smooth journey? 

Managing unexpected windscreen damage is simply part of owning a vehicle, but you can easily protect your wallet by taking proper precautions and avoiding the major culprits listed above.

If you’re currently looking for a reliable used car, come check out our wide range of Carro Certified cars. Our 160-point inspection ensures every Carro Certified car is As Good As New, so you can drive with complete peace of mind.