Concrete Resurfacing vs. Tear-Out and Replace: A Decision Framework

A concrete driveway or patio starts to show its age somewhere around year twelve to fifteen in North Carolina — a mix of freeze-thaw damage in the Piedmont and mountains, sun bleaching, and settlement from clay soil movement. The question every homeowner faces at that point is whether to resurface the slab or tear it out and pour new. The honest answer depends on four things: the depth of the damage, the condition of the base, the age of the slab, and how much cosmetic upgrade is on the table.

Resurfacing works when the slab is structurally sound but cosmetically tired. That means hairline cracks under an eighth-inch wide, a surface that is worn or lightly spalled but has not lost thickness, and no visible settlement or heaving that would suggest a compromised base. A pro will pressure wash the slab, chip out and patch any deeper damage, apply a bonding primer, and pour a polymer-modified overlay one-quarter to one-half inch thick over the existing slab. The overlay can be plain gray, colored, or stamped to look like new decorative concrete. Done right, it lasts fifteen to twenty years.

Resurfacing does not work when there is a base problem. Cracks wider than one-quarter inch, sections that have settled to a visible offset with the rest of the slab, or heaving from expansive clay all indicate the base under the slab has failed. Overlays applied to a compromised base crack in the same pattern as the original slab within a year or two. Any pro who quotes an overlay on a heaving slab is either underqualified or padding their book.

Age matters more than most people expect. Concrete continues to gain compressive strength for decades, but its bond capacity to a new overlay depends on the surface condition. Slabs over twenty-five years old with carbonated surfaces sometimes need a mechanical scarification before an overlay will bond reliably. A pro will run a bond test — a small overlay patch pulled off after a curing period — before quoting a full resurface on an older slab. Skip the test and the overlay may delaminate in year two.

Cost in North Carolina, for a typical residential driveway, breaks down roughly like this. A full tear-out and replace at nine dollars per square foot for plain gray, four inches thick with a compacted base and standard reinforcement. A resurface at three to five dollars per square foot for a polymer overlay, five to eight dollars per square foot for a stamped decorative overlay. So a five-hundred-square-foot driveway is roughly forty-five hundred dollars to replace, and fifteen hundred to four thousand to resurface. The math favors resurfacing on borderline slabs and full replacement on badly compromised ones.

There are two situations where replacement is the honest answer even if the numbers look close. First, if the slab was originally undersized — three inches instead of four, or four inches for a heavy-vehicle driveway — no overlay saves it. Second, if drainage is bad, tearing out lets you fix grade and add subsurface drainage that no overlay can address.

Any working NC concrete pro will walk your slab with you and give a straight answer. If a pro insists on resurfacing without inspecting for base movement, or insists on replacement without checking whether the base is sound, you are not talking to the pro — you are talking to whichever answer their crew is set up to sell that week. Get a second opinion.