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Concrete resurfacing and concrete overlay are terms often used interchangeably to describe the process of applying a new, thin layer of pre-blended concrete over an existing slab. This process enhances the durability and appearance of the concrete, giving it a fresh look without the high cost of a full replacement. The new layer is typically between 1/4-inch and 1-inch thick, significantly less than the 4 inches required for a new slab, and can be stamped, colored, or textured for a custom finish.

While the terms are often considered the same, their meaning can sometimes vary by contractor. Some may use "overlay" to describe a thicker application that adds structural integrity, while "resurfacing" might refer to a thinner layer intended for cosmetic upgrades. Other common names for this process include concrete restoration, concrete refinishing, and concrete rejuvenation.

A concrete overlay on an existing slab can range from 1/4 of an inch to 2 inches thick, though a minimum of 2 inches is often recommended to ensure stability and quality. The ideal thickness depends on the condition of the existing concrete and the depth of any planned designs or imprints. Before applying the overlay, it's important to repair and clean the surface, then apply a primer. For specialized work like a stamped concrete overlay, hiring an experienced contractor is recommended to determine the correct thickness and ensure the new layer isn't too high or heavy. For context, most standard concrete slabs are between 4 and 6 inches thick.

You can pour concrete over asphalt if it’s in good condition, thick, stable, and well-compacted. Concrete is more durable than asphalt and can extend the lifetime of your driveway without having to pay frequent asphalt driveway repair costs or replace it completely. 

But this is best reserved as a temporary solution based on budget restraints, as asphalt requires more frequent repairs and assessments than concrete. Once that concrete top is poured, it’ll be harder to accurately understand what’s happening beneath that layer, which could lead to more issues.

For homeowners, it’s better to dry grind concrete. Dry grinding is the method described above and can be done by experienced DIYers for smaller projects. Wet grinding requires a big volume of water, a way to collect the slurry created by the water and dust, and an environmentally-safe place to dispose of the slurry. In general, only professionals do wet grinding.