Older DeKalb County lots carry decades of repairs, and each layer changes the next decision

A lot that has been paved over and over

When a parking lot starts to look worn, the most common response is an overlay: a new layer of asphalt placed on top of the old one. Done once on sound pavement, that is a reasonable choice. Done repeatedly over decades, it builds up a stack of layers, each one resting on the one beneath and each carrying the cracks of the layer below it.

Cracks in the old surface tend to work their way up through a new overlay over time, a process called reflective cracking. On a lot with several overlays, the crack pattern of the original pavement can still be read on the surface, sometimes along with the patterns of every layer since.

Each overlay also raises the surface. On older properties, that added height changes how the pavement meets curbs, sidewalks, building entrances and drainage structures, and those changes shape what can be done next.

Lost curb reveal and what it tells you

Curb reveal is the height of the curb face above the pavement. A new curb stands clearly above the asphalt beside it. After a few overlays, that reveal shrinks until the curb is almost flush with the parking surface.

When the reveal is gone, the curb stops doing its job. Water that should be guided along the gutter line to an inlet spills over the curb and into landscape beds or against the building. Vehicles roll over curbs that were meant to stop them. At building entrances and walkways, the pavement may end up higher than the sidewalk, sending water toward doors.

A quick walk along the curb lines of an older lot shows this clearly. If the curb is barely visible in places, adding yet another overlay on top will make the drainage worse. Milling off the old layers to restore the reveal, or resetting the curb, usually has to be part of the plan.

Patches on patches

Many older DeKalb County lots show a patchwork of repairs made over years: skin patches laid over cracked areas, cut-and-replace patches of different ages, and patches placed inside earlier patches. Each one was a reasonable response to a single problem at a single moment.

Taken together, though, they tell a story. When patches keep failing along their edges, or when new cracking appears right beside them, the underlying base or subgrade is usually the issue, not the surface. Water has been getting in for years and the clay beneath has lost support.

At some point, patching becomes a way of maintaining the appearance of a lot that needs structural work. The number of patches, their age and how quickly they fail are useful clues about where that point is.

Aging drainage structures under older pavement

Older properties often have drainage inlets, pipes and catch basins that are as old as the original pavement. Over time, brick or block structures crack, mortar joints loosen, pipes shift and grates rust. Each overlay may also leave the grate sitting lower than the surrounding pavement, creating a sunken ring around it.

When a structure cracks or a pipe joint separates, soil can wash into it. That leaves voids beneath the asphalt around the structure, which eventually drop into a depression or a hole. Patching the depression without inspecting the structure only fills it until the next washout.

Before a major paving project on an older lot, it is worth having the drainage structures opened, inspected and, where needed, rebuilt or reset to match the new finished grade. Doing this work after the lot is repaved means cutting into new asphalt.

Signs a lot may be past another round of repairs

• Alligator cracking covering large areas rather than isolated spots.
• Patches that fail along their edges within a season or two.
• Curb reveal nearly gone along long stretches of the lot.
• Water ponding in the same places after every rain despite past repairs.
• Settled or sunken areas around inlets and catch basins.
• Reflective cracking that returns quickly after each overlay.
• Pavement rising above sidewalks or entry thresholds.

Repair round or reconstruction: how to decide

The choice is rarely all or nothing. Many older lots can be handled with a mix: full-depth reconstruction in the areas where the base has failed, milling and resurfacing where the structure is still sound, and drainage repairs throughout.

The key question is how much of the lot has lost structural support. Cores or test pits can show how many layers are present, how thick they are and what condition the base and subgrade are in. That information is far more useful than a surface inspection alone.

A second question is how long the owner expects to keep the property and what the budget cycle looks like. A church or school planning to stay for decades may benefit from reconstructing once instead of patching every few years. A property facing redevelopment may reasonably choose targeted repairs to carry it for a limited time.

Either way, a good proposal explains which approach is recommended for each area and why, instead of pricing a uniform overlay across the whole lot.

Planning work on institutional and retail properties

Churches, schools and retail strips each have their own timing constraints. Church lots are busiest on specific days and evenings, schools on weekdays during the academic year and retail strips during business hours.

Reconstruction work takes longer than an overlay and may require phasing, temporary access routes and coordination with tenants or program schedules. Planning around those patterns, and allowing for weather delays in summer thunderstorm season or wet winter stretches, keeps the project from running into the property calendar.

For an older lot, it also helps to keep records of what was done: which areas were reconstructed, which were milled and overlaid, and which drainage structures were rebuilt. Those records make the next decision much easier.

What managers here ask most

The work, by type

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