How to Fix Large Cracks in an Asphalt Driveway (And When to Call a Pro)
Large cracks in asphalt don’t stay large cracks for long. Left alone, they become potholes. Potholes become section failures. Section failures become full repaving jobs. For a property manager overseeing a parking lot, or shared road, that gap in cost can be significant — and it’s entirely avoidable with timely maintenance. If you manage properties in Indiana or Southern Illinois, you know how hard winters are on asphalt — and how fast a neglected crack becomes an expensive problem.
The good news: if you catch them early and use the right repair method, large asphalt cracks are very fixable. This guide walks you through what causes them, how to tell which repair approach fits your situation, and what the professional process actually looks like — so you can make a confident decision about next steps.
Why Large Cracks Are a Bigger Problem Than They Look
A crack in asphalt is an open door for water. When water gets below the surface, it softens the sub-base. In cold climates like Indiana and Illinois, that water freezes, expands, and breaks apart the base layer from the inside. What started as a ½-inch crack can turn into a pothole in a single winter.
For property managers, the math is blunt: crack sealing is one of the most affordable maintenance services in pavement management. Patching a pothole or failed section costs significantly more. Full section replacement or resurfacing is a capital expense that could often be avoided entirely with earlier intervention.
Cracks also signal different things depending on their pattern. That matters for deciding how to fix them.
Types of Large Cracks — Know What You're Dealing With
Before choosing a repair method, take a close look at the crack pattern. Not all cracks are created equal.
Alligator Cracking (Fatigue Cracking)
Wide Transverse or Longitudinal Cracks
Edge Cracks
Cracks running along the pavement’s edge are usually caused by poor drainage or weak sub-base support at the sides. Sealing the crack helps, but the drainage issue also needs to be addressed, or the cracking will return.
Block Cracking
Large rectangular-shaped cracks dividing the pavement into blocks. Usually caused by asphalt hardening with age. Crack sealing works well here if the base is still sound.
If you’re seeing alligatoring across large areas, don’t try to seal your way out of it. But for isolated wide cracks with a stable base beneath, professional crack sealing is the right call.
DIY vs. Professional Crack Repair — An Honest Breakdown
Hardware stores sell cold-pour crack fillers, and they work fine for narrow cracks — less than ¼ inch wide. For a hairline crack or small transverse crack, a cold-pour product cleaned and applied properly will extend the pavement’s life.
For large cracks — anything wider than ¼ to ½ inch — cold-pour products often fail within a season. The material can’t properly bond to the wider gap walls, and it doesn’t have the flexibility to move with the pavement through freeze-thaw cycles. You end up with a repair that looks fine in September and cracks again by April.
What professional repair actually uses:
Professional contractors like HSC Pavement Maintenance use hot-applied crack sealants — a single-component, rubberized material melted to 350–400°F in oil-jacketed, continuously agitated melters. That process matters. The material heats evenly, mixes thoroughly, and bonds properly to the crack walls, forming a flexible, resilient, non-tracking seal that moves with the pavement rather than cracking against it.
Many lower-tier contractors use direct-fire methods, where the material is unevenly heated, not agitated, and inconsistently applied. The result looks similar at first but deteriorates much faster — and you’re back to square one within a year or two.
For a property manager overseeing a commercial parking lot, apartment complex , or shared road, the professional approach isn’t just a nicer result — it’s the better value.
Not sure if your pavement needs crack sealing or something more? Contact HSC for a free pavement assessment — we’ll give you an honest read before you spend a dollar.
Step-by-Step: How Professionals Repair Large Asphalt Cracks
Here’s what the professional crack repair process looks like from start to finish:
1. Assess the Crack
The technician measures the crack width and checks the surrounding pavement for signs of base failure (soft spots, alligatoring, drainage pooling). This determines whether crack sealing is the right move or whether patching is needed.
2. Clean the Crack
Debris, vegetation, moisture, and loose material are blown out using compressed air or a heat lance. A clean crack bonds properly. A dirty crack doesn’t, regardless of the material used.
3. Route the Crack (for large or irregular cracks)
For large cracks, routing the crack first creates a uniform reservoir shape — typically a straight-sided channel about ½ to ¾ inch wide. This dramatically improves sealant adhesion and extends the life of the repair.
4. Apply Hot-Applied Sealant
The melted sealant is poured in a controlled band, slightly overfilled to account for settling. The material self-levels into the crack and bonds firmly to both walls.
5. Allow to Cure
In good conditions, traffic can resume in as little as 20 minutes. For commercial properties with active tenants or customers, this minimal downtime matters.
6. Plan Follow-Up Sealcoating
Crack sealing addresses the open cracks, but the surrounding asphalt surface continues to oxidize and dry out. Pairing crack sealing with sealcoating in the same maintenance window protects the rest of the surface and gives the pavement a uniform, clean appearance.
What to Expect — Cost, Timing, and Disruption
For property managers, two things usually come up before authorizing any pavement work: cost and disruption.
Cost: Professional crack sealing is one of the most cost-effective maintenance services in pavement management. Exact pricing depends on linear footage, crack width, and site conditions. HSC offers free estimates — there’s no guesswork before you commit.
Timing: The actual application is fast. A typical property can have crack sealing done in a few hours, and traffic resumes quickly. Unlike concrete or cold-patch work, hot-applied crack sealant doesn’t require extended cure windows.
Disruption: Minimal. The crew handles the prep and application, the affected areas are briefly coned off, and the property is back to normal same-day in most cases.
Combining crack sealing with sealcoating during the same visit — if the pavement is otherwise in good condition — maximizes the value of a single mobilization and gives the property’s pavement the best protection going forward.
When It's Beyond a Crack Seal — Signs You Need More
Crack sealing is the right tool for the right job. But it’s not the right tool for every job.
If you’re seeing any of the following, the pavement likely needs more than crack sealing:
- Widespread alligatoring: Widespread alligatoring covering 30% or more of the surface
- Soft or spongy spots: Soft or spongy spots when you walk on the pavement — a sign the sub-base has failed
- Potholes or depressions: Potholes or depression areas where the asphalt has sunk or broken through
- Failed prior repairs: Multiple overlapping crack repair attempts that haven’t held — the base is likely the problem
In these cases, asphalt paving, patching, or full resurfacing is the appropriate solution. Trying to seal a structurally compromised surface just delays the inevitable — and wastes money in the process.
The right first step is an honest pavement assessment. HSC Pavement Maintenance offers free evaluations and pavement management consulting. We’ll give you an honest assessment of what the pavement actually needs and help you prioritize accordingly.
Frequently Asked Questions
Can I fill large asphalt cracks myself?
Cold-pour products work for narrow cracks (under ¼ inch). For anything wider, a DIY repair typically won’t hold through a full freeze-thaw cycle. Hot-applied professional sealant is the right approach for large cracks.
How wide does a crack need to be before it needs professional repair?
Cracks wider than ¼ to ½ inch generally need professional attention. Anything showing alligatoring — the connected web pattern — warrants a professional assessment to rule out base failure before any surface treatment.
How long does professional asphalt crack sealing last?
Hot-applied crack sealants typically last 3–7 years, depending on traffic volume, climate, and the overall condition of the pavement. Regular maintenance and sealcoating after crack sealing extend that lifespan further.
Does crack sealing prevent potholes?
Yes — this is one of its primary purposes. Sealing cracks early prevents water from infiltrating the sub-base, which is the main cause of pothole formation. It’s a proactive investment in preventing a far more expensive problem.
How soon can the pavement be used after crack sealing?
In ideal conditions, traffic can resume in as little as 20 minutes after hot-applied crack sealing. HSC’s sealant is formulated to avoid tracking or picking up on vehicle tires. For more pavement maintenance tips and guides, visit the HSC blog.
Get a Free Crack Sealing Estimate
Large cracks don’t fix themselves — and waiting makes them worse. If you’re managing a property in Indianapolis, Evansville, Southern Indiana, or Southern Illinois and you’re seeing significant cracking in the asphalt, the smartest move is a professional assessment before the next winter cycle hits.
HSC Pavement Maintenance has over 50 years of experience providing crack sealing, asphalt patching, sealcoating, and full pavement management services to property managers, commercial facilities, municipalities, and residential home drives across the region.
