Overview

Parking lot repaving can involve anything from installing a new asphalt surface to rebuilding damaged pavement from the ground up.

In this blog, CSI Paving, Inc explains when repaving is necessary, how contractors choose the appropriate method, and what happens during preparation, asphalt installation, and finishing.

Highlights

Introduction

When your parking lot reaches the point where patching potholes and filling cracks no longer provide lasting results, repaving may be the next step. But what does that actually involve? Will contractors have to tear up the entire lot, or can they install new asphalt over what's already there?

The answer depends on the condition of your existing pavement. Repaving can involve several different approaches, each requiring different preparation and installation work. Understanding the process will help you know what to expect when it's time to restore your parking lot.

When Does a Parking Lot Need Repaving?

Not every cracked or damaged parking lot needs to be repaved. Isolated potholes, minor cracks, and localized surface deterioration can often be addressed through repairs, particularly when the surrounding asphalt remains in good condition.

Repaving becomes a stronger consideration when deterioration affects large portions of the lot or when repaired areas repeatedly fail. Instead of addressing individual defects, the work focuses on restoring larger sections of pavement.

Some common warning signs include:

  • Widespread cracking that continues to expand despite repairs
  • Recurring potholes in previously patched areas
  • Deep ruts along heavily traveled sections
  • Extensive crumbling and loose aggregate
  • Sunken areas where rainwater regularly collects

Extensive Asphalt Cracking and Deterioration

Small, isolated cracks can often be sealed to prevent water infiltration and further deterioration. However, when cracking spreads across large areas or develops into interconnected patterns resembling alligator skin, the asphalt may have weakened beyond what routine repairs can address.

At that point, repaving may be necessary to restore the deteriorated pavement. Whether the existing asphalt can be resurfaced or needs to be removed depends on how deeply the damage extends.

Structural Damage to the Parking Lot's Base and Subbase

Beneath the asphalt are layers of compacted aggregate that support vehicle loads. When these layers weaken due to water infiltration, settling, or inadequate compaction, the damage may appear as deep ruts, recurring potholes, or sunken sections.

Installing new asphalt over a compromised base won't correct the underlying problem. Contractors must remove the affected pavement and repair or rebuild the damaged supporting layers before installing new asphalt. Depending on the extent of the failure, this may involve individual sections or the entire parking lot.

How Do Contractors Choose a Repaving Method?

Before work begins, contractors assess the condition of the existing asphalt and its underlying support to determine how much material needs to be removed or replaced.

The approach generally falls into one of three categories:

  • Asphalt overlay: A new layer of asphalt is installed over the existing pavement when it's structurally sound and suitable for resurfacing.
  • Milling and resurfacing: Contractors remove the deteriorated upper asphalt layer and replace it with new material, preserving the sound pavement underneath.
  • Full-depth replacement: The existing asphalt is removed, and damaged supporting layers are repaired or rebuilt as necessary before new pavement is installed.

How Is a Parking Lot Prepared for Repaving?

Once the repaving method has been determined, contractors can prepare the parking lot for construction. Although the amount of pavement removal and base preparation varies by project, several preliminary steps are common to most repaving jobs.

These include:

  • Marking the work area: Identifying the sections scheduled for removal and marking any underground utilities that could be affected by excavation.
  • Clearing the parking lot: Removing parked vehicles, dumpsters, and movable obstacles so crews can access the pavement.
  • Establishing traffic restrictions: Setting up barricades and temporary access routes to keep vehicles and pedestrians away from active construction areas.
  • Identifying drainage requirements: Checking existing slopes and catch basins to determine where grading corrections may be needed.

Scheduling will also need to be worked out with your contractor, as you may lose access to some or all of its parking spaces for the duration of the project. You need to agree on working hours, construction dates, and potential temporary arrangements for staff and customers.

Preparing the Existing Surface or Aggregate Base

For an asphalt overlay, crews clean the existing pavement, complete necessary repairs, and prepare it to receive new asphalt. Milling and resurfacing involve removing the deteriorated upper asphalt layer while preserving the sound pavement beneath it.

Full-depth replacement requires additional preparation. Contractors remove the damaged pavement, repair or replace compromised supporting materials, and grade and compact the aggregate base before installing new asphalt.

The aggregate base sits directly beneath the asphalt and consists of crushed stone graded to include different particle sizes. Smaller particles fill the gaps between larger stones, allowing the material to lock together when compacted.

When this step is necessary, the crew you hire will spread the new aggregate in controlled lifts. A motor grader is what’s used to level each lift to the required elevation. The grade must be checked throughout this process, and if it passes, the first binder layer can be applied.

How Is New Asphalt Installed?

New asphalt is applied in layers, each building on the last and creating a pavement surface with the required thickness and a consistent finish. There’s the asphalt binder layer at the bottom, and the asphalt surface layer at the top. Does every parking lot need both? No, but larger lots or areas exposed to heavier traffic often require multiple lifts.

Not every project requires the same mix or compaction methods, either. Below are some of the general steps, along with some of the factors that change the approach.

Applying the Asphalt Binder Layer

The asphalt binder forms the lower portion of the asphalt pavement, sitting directly on the prepared aggregate base. It typically contains larger crushed stone particles than the surface layer, giving it the strength needed to distribute vehicle loads without deforming.

Hot asphalt is delivered to the site by truck and fed into a paving machine, which spreads it across the prepared base at a controlled thickness. Crews then use heavy rollers to compact the material while it's still hot, reducing the air spaces between aggregate particles. This planned sequence creates a dense, stable layer ready to receive the finished surface.

Getting the thickness right matters a lot. Around 2 to 3 inches thick is common, but it’ll depend primarily on the weight of the vehicles using the lot.

Installing the Asphalt Surface Layer

The surface layer forms the finished pavement that drivers see and use. It generally contains smaller aggregate than the binder course, producing a tighter, smoother texture. This layer must also provide adequate traction and shed rainwater toward the parking lot's drainage system.

Before installing the surface course, crews clean the binder layer and, in most cases, apply a thin coating of asphalt emulsion called a tack coat. This helps bond the two courses, so they behave as one pavement structure. A paving machine then places the hot surface mix, with crews carefully matching elevations around curbs and drainage inlets.

Compacting the New Asphalt

Compaction is what gives freshly laid asphalt its final density and helps prevent premature rutting or cracking. Even after the paving machine spreads the material, small air pockets remain throughout the mixture. Rolling presses the aggregate particles closer together, reducing these voids to a controlled level. Too many leave the pavement vulnerable to water infiltration, while too few can cause the asphalt to deform or bleed excess binder onto the surface.

Contractors typically use steel-drum vibratory rollers for the initial passes, followed by additional rolling to achieve the specified density and smooth out any marks. The timing is critical because asphalt becomes harder to compact as it cools. Rolling patterns are also adjusted around curbs and other confined areas where larger equipment cannot reach.

Finishing the Repaved Parking Lot

At this point, the parking lot has a fresh, uniform asphalt surface, with the damaged pavement replaced and the finished grade established. Crews are now making their final checks for uneven areas or imperfections before removing equipment and clearing away leftover materials. The asphalt still needs time to cool and harden.

For most newly paved parking lots, light vehicle traffic can resume within 24 to 48 hours, although the contractor will determine the appropriate reopening time based on the weather and asphalt conditions. Heavy vehicles may need to stay off the pavement longer, and sharp turns or stationary steering should be avoided while the asphalt is still relatively soft.

Parking Lot Striping and Pavement Markings

Once the new asphalt has cooled sufficiently, one of the final steps is to apply fresh parking lot striping and pavement markings. These are expected features of commercial parking areas, helping drivers navigate the property while supporting accessibility requirements under the Americans with Disabilities Act (ADA).

These markings can also help establish:

  • Clearly defined parking spaces
  • Directional arrows and traffic lanes
  • Pedestrian crosswalks
  • Fire lanes and no-parking zones
  • Designated loading and pickup areas

Striping is scheduled after the asphalt has cooled and the surface is ready to accept paint, although the exact timing depends on the marking material and the contractor’s recommendations.

Schedule Professional Parking Lot Repaving

If your parking lot is showing widespread damage and repairs aren't holding up, you have other options. CSI Paving, Inc can inspect the condition of your pavement, determine whether parking lot repaving is necessary, and complete the work needed to give your property a fresh start.

Call (310) 612-1359 to discuss your parking lot repaving project today.