How thick your slab should be — and the mix and mesh to match.
Slab thickness balances strength and cost. Here are the South African norms by slab type.
| Slab | Thickness | Mix |
|---|---|---|
| Surface bed (house) | 85–100mm | 25 MPa + mesh |
| Driveway | 100–125mm | 25–30 MPa |
| Suspended slab | per engineer | 30 MPa |
Why builders choose us
- ~100mm house surface bed
- Ref mesh in the slab
- 25–30 MPa mix
- Compacted G5 base
Related pages
Frequently asked questions
How thick should a concrete slab be?
About 85–100mm for a house surface bed and 100–125mm for a driveway, with reinforcing mesh.
What concrete mix for a slab?
A 25 MPa mix suits most slabs; use 30 MPa for driveways and suspended slabs.