How Much Do I Need?
Use these tables to work out how much you need.
Sand
length (ft) × width (ft) × depth (in) ÷ 265 = tonnes + waste
length (m) × width (m) × depth (m) × 1.6 = tonnes + waste
Gravel
length (ft) × width (ft) × depth (in) ÷ 250 = tonnes + waste
length (m) × width (m) × depth (m) × 1.7 = tonnes + waste
Plastering
One tonne of sand plasters approximately 30m² of wall 20mm thick
Brick and Block Laying
One tonne of sand lays approximately:
1000 × 4½ × 9 × 3 inch Bricks
600 × 4 × 18 × 9 inch Solid Blocks
400 × 6 × 18 × 9 inch Solid Blocks
250 × 9 × 18 × 9 inch Solid Blocks
Concrete
| Nominal Mix | Approx 28-day Strength | Cement by Volume | Ballast by Volume | Kgs of cement per tonne Mixed Ballast | ||
|---|---|---|---|---|---|---|
| Cement | Sand | Stone | ||||
| 1 | 1.5 | 3 | 25 MPa | 1 | 4 | 200 |
| 1 | 2 | 4 | 21 MPa | 1 | 5 | 150 |
| 1 | 3 | 6 | 10 MPa | 1 | 8 | 100 |
| 1 | 4 | 8 | 7 MPa | 1 | 10 | 75 |