Asphalt Repair: Potholes, Patching, and When to Replace

Asphalt repair is the work that saves a parking lot or driveway from full replacement. Every pothole, alligatored area, and sunken edge has a root cause, and the right fix depends on whether the failure is in the surface or down in the base. This guide covers the main types of asphalt failure, the repair methods that match each one, what they cost, and how to tell when a patch will hold versus when you are throwing money at a problem that needs a bigger solution.

Why asphalt fails

Asphalt fails for a handful of predictable reasons. Understanding the cause tells you which repair actually fixes it:

• Water intrusion. Cracks let water reach the base, which softens and erodes it. The surface above loses support and breaks. This is the number one cause of potholes.
• Oxidation. Sun and air turn the binder brittle. The surface cracks, and those cracks channel water into the base.
• Heavy loads. Truck traffic, trash trucks, and trailers stress pavement designed for cars, especially in turning areas.
• Poor drainage. Standing water saturates the sub-base and accelerates every other failure mode.
• Base failure. If the stone base was under-built, poorly compacted, or saturated, the pavement above flexes, cracks, and sinks no matter what you do to the surface.
• Utility cuts. Trenches for water, sewer, or electric lines are common failure points if the backfill and compaction were not done right.

Common types of asphalt failure

Alligator cracking

Interconnected cracks that look like reptile skin. This is not a surface problem; it means the base beneath has failed and the pavement is flexing under load. Sealcoating over alligator cracking does nothing. The fix is full-depth repair: saw-cut, excavate, rebuild the base, and replace the asphalt.

Potholes

Bowl-shaped voids where the surface has broken away. They start as cracks, take on water, and grow through freeze-thaw and traffic. Small potholes can be patched; recurring ones in the same spot usually mean a base problem.

Edge cracking

Long cracks along the edge of pavement, common where there is no curb or the base tapers off. Water undermines the edge and pieces break away. Edge repair adds support and seals the edge against water.

Depressions and rutting

Sunken areas or wheel ruts form when the base compacts under load or the mix was unstable. Depressions collect water, which accelerates failure. Shallow ruts may be addressed with an overlay; deep structural rutting needs full-depth work.

Asphalt repair methods

The method has to match the failure. Using the wrong one is how the same pothole comes back next season.

Skin patching

A layer of hot mix laid over a degraded area, leveled and compacted. Good for surface failures and shallow depressions where the base is still sound. Fast and affordable, but it does not fix base problems.

Full-depth saw-cut repair

The correct fix for base failures. The failed area is saw-cut in straight lines, excavated to the base, the stone base is recompacted, tack coat is applied, and hot-mix asphalt is installed and compacted flush. This is the repair that lasts.

Infrared patching

An infrared heater softens the existing asphalt so new material can be blended in and compacted as one seamless surface. Good for surface-level failures, seams, and small areas, with no saw-cut edges. Less suited for deep base failures.

Cold patch

Bagged material raked into a pothole and tamped. A temporary, emergency fix for winter or when hot mix is not available. It is not a permanent repair and will not last a full season under traffic.

How much does asphalt repair cost?

Pricing depends on the method and the size of the failed area. These are budgetary ranges confirmed after an on-site assessment:

When to patch versus replace

Use this as a decision framework, not a rule:

• Isolated pothole, sound surrounding pavement: patch it.
• Wide alligatored area with base failure: full-depth repair, or the area may warrant an overlay or section reconstruction.
• Widespread cracking across the whole lot: the surface is failing systemically. An overlay or reconstruction is more cost-effective than dozens of patches.
• Recurring failure in one spot: investigate the base and drainage before repairing again.

Can asphalt be repaired in winter?

Hot-mix plants close in winter, so full-depth and hot-mix repairs are limited to warmer months. In winter, cold patch is the stopgap to keep a pothole safe and contained until spring, when a permanent hot-mix repair can be done. Infrared patching can work in cooler weather but has temperature limits.

How long does an asphalt patch last?

A properly done full-depth repair can last as long as the surrounding pavement. A skin patch over a sound base typically lasts several years. A cold patch is temporary, measured in weeks to a few months. The lifespan is almost entirely a function of whether the repair matched the failure and whether the base was addressed.

What causes asphalt to sink?

Sinking means the base or subgrade below is compacting, washing out, or was never properly compacted to begin with. Utility trench backfill is a common culprit. Sinking areas collect water, which makes the underlying problem worse. The fix is to excavate, address the base, recompact, and replace the surface, not to fill the depression on top.

What to look for in a repair contractor

• Do they diagnose the root cause before quoting, or just quote a patch?
• Do they explain the difference between surface and base failure?
• Do they offer the right method for the failure, not just the one they happen to sell?
• Do they saw-cut straight edges and compact properly on full-depth work?
• Do they tell you when a patch will not hold and a bigger fix is needed?

The most valuable thing a contractor can tell you about a repair is when not to do it. Patching a base failure is the most common waste of pavement maintenance money we see. For related reading, see our guides on asphalt maintenance and crack filling vs crack sealing.