Load-bearing capacity
What defines Road Base 2.1 – CBR80 is its California Bearing Ratio (CBR) of 80, a strong measure of how much load it can carry and how well it holds together.
Road base · 09.01
Road Base 2.1 – CBR80
Our strongest road base. CBR80 compacts into a solid, stable, water-resistant foundation for roads, carparks, driveways and slabs.
- Type 2.1
- CBR 80
- Water-resistant
- Sold per m³
Quick answer
With a California Bearing Ratio of 80, Road Base 2.1 – CBR80 is the toughest grade in our yard, and CBR80 and above is the mark for heavy-duty, high-traffic pavements. Laid 100–150mm deep and compacted, it forms a solid, water-resistant, low-upkeep foundation for carparks, driveways, road building and the layer beneath concrete slabs or pavers.
| Grade | Type 2.1 |
|---|---|
| CBR | 80 |
| Best for | Heavy-duty, high-traffic pavements |
| Sold by | The cubic metre |
| Typical depth | About 100–150mm compacted |
| Coverage | About 7–10 m² per m³ |
| Approx. weight | About 2.0 tonnes per m³ |
These coverage and weight figures are a guide. Work out your own area with the volume calculator.
Why choose it
What it does well
- 01Solid stable foundation
- 02Water-resistant
- 03Durable
- 04Minimal upkeep
- 05Cost-effective
Good jobs for it
Where it gets used
- 01Carparks
- 02Driveways
- 03Road construction
- 04Foundation layers under concrete slabs or pavers
Compare grades
Picking the right road base grade
CBR (California Bearing Ratio) tells you how much load a compacted base can carry. A higher number means a stronger base.
| Grade | CBR | Typical use |
|---|---|---|
| Road Base 2.1 – CBR80 | 80 | Heavy-duty, high-traffic pavements and road building (this product) |
| Road Base 2.3 – CBR45 | 45 | Standard roads, driveways and parking areas |
| Road Base 2.5 – CBR15 | 15 | Landscape levelling, paver bases and light-duty areas |
Water-resistance
Road Base 2.1 is designed to resist water, which lowers the risk of the material breaking down in the elements. Through rain, flooding or high moisture it stays intact and dependable, making it a strong all-weather choice.
Road Base 2.1 – CBR80: your questions answered
Which jobs need CBR80 road base?
Anything carrying heavy or constant traffic, like roads, carparks and commercial driveways, as well as the foundation layer under slabs and pavers.
Does a house driveway need 2.1 road base?
Not always. CBR45 (Type 2.3) is the usual choice for a standard driveway. Go with 2.1 where heavy vehicles or lots of traffic will use the surface.
How many cubic metres of road base should I order?
Plan on 100–150mm compacted. At that depth, one cubic metre covers roughly 7–10 m². Order a little extra, as it compacts down.
Describe the job. We’ll work out the quantity.
Tell us what you need, how much of it and where it’s going, and we’ll reply with a price and a delivery time.