What Is Asphalt Patching?

Cold-mix patching is the fastest option — pour the mix into the hole, tamp it down, and it sets up enough to drive on in minutes. It is the right tool for emergency winter potholes when hot-mix is not available, but the mix lacks the binder strength to last through a freeze-thaw cycle. Plan on replacing cold patches within a year.

Hot-mix patching is what we use for a permanent repair. The damaged area is saw-cut to a clean rectangle, excavated to a sound base, the base is recompacted, and fresh hot-mix asphalt is paved and rolled to full density. A properly done hot-mix patch lasts as long as the rest of the surface around it.

Infrared patching heats the existing asphalt with an infrared heater until the binder softens, mixes in a small amount of fresh asphalt, and re-compacts the area. It produces a seamless, joint-free repair that bonds chemically with the surrounding pavement. Infrared works well for shallow surface damage but cannot fix base-level failure.

Patching makes sense when the failure is localized and the surrounding pavement is healthy. A pothole in an otherwise sound lot, a discrete crumbling area near a catch basin, a low spot that collects water — all good patching candidates.

If the same lot has widespread alligator cracking, multiple base failures within a few feet of each other, or a section where the failure pattern keeps spreading, patching is throwing good money after bad. At that point the right move is mill-and-overlay or full-depth reclamation of the failed section.

A patch is only as good as the base it sits on. The most common reason a patch fails within a year is that the contractor patched the surface without addressing the base failure that caused the pothole in the first place. Water still finds the weak spot, the base still moves, and the patch cracks at its perimeter and crumbles within a season.

When we patch a failed area, we excavate to whatever depth the base is sound — sometimes that is six inches, sometimes it is a foot or more — and rebuild the base before laying fresh asphalt. The patch costs more, but you only pay for it once.

A cold patch should be treated as a 3–12 month bridge to a permanent repair. A hot-mix patch with proper base prep should last 10–15 years, roughly matching the design life of the surrounding pavement. Infrared patches usually last 5–10 years depending on traffic and how much underlying surface damage was present when the work was done.

If you are getting a quote for parking lot repair or emergency asphalt repair, ask the contractor which technique they will use and what they expect the patch to last. The answer tells you a lot about whether they are pricing for a real fix or a fast one.