Before coating, resurfacing or replacing a cracked or uneven slab, determine whether the visible surface is the problem—or whether the slab has lost support underneath. Surface Blueprint covers settlement only where it changes the repair decision: driveways, pool decks, patios, garage slabs and other concrete surfaces homeowners may otherwise try to coat or resurface.
Three Very Different Jobs Can Look Similar at First
| Condition | Typical direction | What must be answered first |
|---|---|---|
| Sound, level slab with cosmetic wear | Coating, sealer or decorative resurfacing may be appropriate. | Moisture, contamination, old sealer, cracks and surface profile. |
| Sound slab with spalls/gouges or worn surface | Cementitious overlay or repair plus coating may be appropriate. | Is the existing concrete structurally sound and are cracks/joints stable? |
| Settled, rocking or unsupported slab | Lift, stabilize, replace, or investigate the support problem before cosmetics. | Why did support disappear, is movement continuing, and is the slab still suitable to save? |
The Surface Blueprint Boundary
This section is not a substitute for structural engineering or geotechnical diagnosis. Its purpose is to help homeowners recognize when a surface project has crossed into a support, settlement or structural question. The American Concrete Institute emphasizes that successful crack repair starts with determining the cause and whether cracking is active or dormant. If cracking is caused by continuing foundation settlement, repairing only the crack does not correct the settlement.
Florida Adds a Subsidence Complication
Florida settlement is not automatically a sinkhole. The Florida Geological Survey lists several conditions that can mimic sinkhole activity, including improperly compacted fill, buried organic material, broken drains or septic components, and other subsurface conditions. A driveway panel or pool-deck section that settles should therefore be investigated as a support problem without jumping immediately to one geological diagnosis.
Start Here
- Concrete lifting vs. replacement — when preserving the slab may make sense.
- Polyurethane foam lifting explained — what the injected material is doing below the slab.
- Why Florida slabs settle — erosion, compaction, moisture and other support-loss mechanisms.
- When a crack needs evaluation — warning signs that should come before cosmetic repair.
- Voids under concrete — why filling space is not the same as correcting the water or soil problem that created it.