The short answer
These terms sound similar but solve different problems. Slab leveling raises settled concrete from below; self-leveling products create a flatter surface on top.
Concrete leveling changes slab elevation
Self-leveling underlayment corrects surface flatness
One addresses support below
The other creates a new surface layer
Do not confuse the two
| Concrete / slab leveling | Self-leveling concrete or underlayment | |
|---|---|---|
| Where material goes | Under the slab | On top of the surface |
| Main purpose | Raise settled concrete | Create a flatter surface |
| Fixes missing support? | Can fill voids beneath slab | No |
| Typical use | Driveways, walks, patios, slabs | Floor preparation / overlays |
Common questions
Can self-leveling concrete fix a sinking driveway?
No. Pouring material on top does not restore missing support beneath a settled exterior slab and can add weight.
When is self-leveling concrete appropriate?
It is commonly used as an underlayment or surface preparation system where the substrate is stable but needs a flatter surface.
Use this information to compare quotes
Ask each contractor what material will be injected, how the original cause of settlement will be addressed, what is included in patching and cleanup, and what conditions are excluded from any warranty.