Why Crack Sealing Is One of the Best Investments You Can Make in Your Parking Lot

Asphalt is designed to be flexible, but it isn't immune to the effects of age and weather. Every season places new stresses on your parking lot.

During hot summer days, pavement expands as temperatures rise. When colder weather arrives, the asphalt contracts. This constant movement creates stress throughout the surface, eventually leading to small cracks.

Traffic also contributes to the process. Every vehicle applies weight to the pavement, and areas where cars brake, turn, or accelerate experience even greater stress over time. Add years of exposure to sunlight, rain, snow, and automotive fluids, and it's easy to see why even well-built parking lots eventually begin showing signs of wear.

The important thing to remember is that cracks themselves aren't unusual. What matters is how quickly they're addressed.

The real danger isn't the crack you can see—it's the water you can't.

Once moisture enters through an open crack, it begins affecting the layers beneath the asphalt surface. The stone base supporting the pavement can gradually soften, reducing its ability to carry vehicle loads. During Iowa winters, this process becomes even more destructive.

Water trapped beneath the pavement freezes as temperatures drop. Because ice occupies more space than liquid water, it expands inside the crack, forcing the asphalt apart. When temperatures rise again, the ice melts and leaves behind a slightly larger opening. This freeze-thaw cycle repeats dozens of times throughout the winter, causing small cracks to grow rapidly.

Eventually, sections of pavement begin breaking away, creating potholes and uneven surfaces that require much more extensive repairs.

Crack sealing interrupts this cycle by preventing water from entering the pavement in the first place.

One of the biggest misconceptions about asphalt maintenance is that repairs should wait until visible damage becomes severe. In reality, the opposite approach is usually the most economical.

Crack sealing addresses problems while they're still relatively small and inexpensive to repair. By sealing pavement before moisture reaches the underlying base, property owners can significantly extend the service life of their asphalt.

Crack sealing also works exceptionally well alongside other pavement maintenance services. Many commercial properties include crack sealing before sealcoating to create a cleaner, longer-lasting finished surface. Once those services are complete, fresh parking lot striping restores the organization and appearance of the property.

Instead of viewing crack sealing as an unexpected expense, it should be considered part of a long-term maintenance strategy. Spending a little today often prevents much larger repair bills in the future while keeping your parking lot safer and more attractive for visitors.

What is crack sealing?

Crack sealing is the process of cleaning and filling cracks in asphalt pavement with a flexible sealant designed to prevent water and debris from entering the pavement structure.

When should cracks be repaired?

As soon as practical. Small cracks are much easier and less expensive to seal than larger cracks that have already begun deteriorating into potholes or structural failures.

Does crack sealing repair potholes?

No. Crack sealing is intended for preserving pavement before major damage occurs. Potholes and severe pavement failures typically require asphalt patching or other repair methods.

How often should a parking lot be inspected for cracks?

Commercial parking lots should be visually inspected at least once each year, with additional inspections recommended after winter due to Iowa's freeze-thaw conditions.

Should crack sealing be completed before sealcoating?

Yes. Cracks are typically repaired first so the sealcoat can be applied over a properly prepared surface.

Is crack sealing worth the cost?

In most cases, absolutely. Preventing water intrusion is one of the most effective ways to extend pavement life and reduce future repair expenses.

Cracks may seem like a minor issue, but they are often the first visible sign that your pavement needs attention. Once water begins working beneath the surface, deterioration can accelerate quickly—especially in Iowa's challenging climate.

By incorporating crack sealing into your regular maintenance schedule, you can protect your asphalt, extend the life of your parking lot, and reduce the likelihood of expensive repairs in the future. It's a simple investment that pays dividends in both appearance and long-term pavement performance.