Cosmetic crack or settlement: reading a new slab
Builder warranties in the Kathleen subdivisions generally class surface cracking in flatwork as cosmetic. That is not always wrong: concrete shrinks as it cures, and a slab without working joints has to crack somewhere. What the warranty skips is the difference between shrinkage and a slab that is sinking:
| What you see | Likely cause | What it needs |
|---|---|---|
| Hairline to 1/4 inch, both sides level | Shrinkage, missing or shallow joints | Route and seal, from $450 |
| One side higher than the other | Settled fill, usually at the garage | Foam leveling, $600 to $2,500, then seal |
| Diagonal crack off a corner near a downspout | Water softening the clay under it | Fix the drainage, then level or seal |
| Flaking, pitting, exposed stone on top | Finished too early or no cure | Overlay at $4 to $8 per sq ft, once stable |
| Under 3.5 inches, four or more pieces that rock | Thin pour on loose backfill | Replacement |
We measure thickness at an exposed edge, record the offset across every crack, and photograph it; that one-page report comes with the quote and goes to the builder when the first answer was cosmetic.
What a one-year-old driveway with a 1/4-inch crack actually needs
Usually nothing structural. If both sides are level and the crack has not widened since you noticed it, it is a shrinkage crack that found its own path because the builder's joints were too shallow. Sealing it keeps water out of the red clay under the base. The repair:
- Chase the crack with a diamond blade to a 1/4 by 1/4 inch groove.
- Blow it out, backer rod where it runs deep.
- Self-leveling polyurethane, which flexes with the clay.
- Saw the builder's shallow joint lines to a full inch so future cracking has somewhere to go.
That visit bills at the $450 minimum and is done in a morning. One hairline on a sound slab can wait, and we say so. Epoxy injection and garage-slab cracks are on the main repair page.
Overlays in Kathleen: only on slabs that have stopped moving
Resurfacing bonds 1/4 to 1/2 inch of polymer-modified overlay to the old surface. It hides spalling and poor finishing, and an 800-square-foot driveway resurfaces for $3,200 to $6,400 against $5,000 to $8,500 to replace. The catch in Kathleen: slabs poured on fresh fill around a new foundation keep settling for years, and an overlay on a driveway still dropping at the garage cracks along the same line its first winter.
So for a slab under five years old, show us it has stopped. If the offset at the garage joint has not changed in six months and the slab is at least 3.5 inches thick, we quote the overlay. If it has moved, the order is fix the water, lift, then resurface. Sandhill Concrete matches your project with a licensed Houston County concrete contractor, who measures on site, writes the quote and does the work.
Lifting instead of patching
The most common Kathleen repair is not a crack but a driveway that has dropped 1/2 to 1 inch at the garage door, in one or two pieces, with a lip the mower catches. Feathering mortar over it is a six-month fix. Foam leveling at $600 to $2,500 drills a few 5/8-inch holes, injects expanding foam under the low section, and lifts it back to grade in a morning. A slab in six pieces lifts unevenly and goes on the removal list instead.
Kathleen repair prices
| Repair | Price | Time on site |
|---|---|---|
| Route and seal driveway or patio cracks | From $450 | Half a day |
| Foam leveling of a settled section | $600 to $2,500 | Half a day |
| Overlay on a stable slab | $4 to $8 per sq ft, $1,200 minimum | Two days |
| Replace a two-car driveway | $5,000 to $8,500 plus $2 to $4 per sq ft removal | Three days |
With many Robins Air Force Base families here on three-year orders, a repair done before the listing beats a repair credit at closing. Replacement math is in the driveway cost guide, tear-out notes on the Kathleen driveway page, and the rest of our Kathleen work on the Kathleen service area page.
Questions we get asked
The builder says my driveway cracks are cosmetic. Are they?
If both sides are level and nothing rocks, probably yes, and route-and-seal is all it needs. If one side sits higher or the slab has dropped at the garage, the base is settling, and we document that for the builder.
How do I tell if my driveway is still settling?
Lay a straightedge across the garage joint and the widest crack, measure the offset, and pencil the numbers and date on the slab edge. Check again in six months. No change means an overlay or sealing will hold; a bigger gap means lift first.
Can you resurface a driveway that is three years old?
Yes, if it has stopped moving and is at least 3.5 inches thick. One still dropping at the garage is not a candidate, and we say so.
Does sealing a crack affect the builder's warranty?
We cannot speak for a builder's warranty. Sealing is maintenance and does not change the slab, but photograph and measure the cracks and send that to the builder in writing before any work.
Get a written quote
Tell us what you need and where. Sandhill Concrete matches your project with a licensed Houston County concrete contractor, who measures on site, writes the quote and does the work. You hear back within one business day by text or email with a site-visit window, and the written quote states thickness, reinforcement, base and removal so you can compare it line by line.
More in Kathleen
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