Why Choose Concrete for Your Driveway?

A properly constructed concrete driveway offers excellent longevity, low maintenance, and a clean appearance. Unlike asphalt, it doesn't soften in hot weather, and unlike loose gravel, it provides a firm, dust-free surface year-round. The upfront investment is higher than some alternatives, but the long service life — often 30 years or more with proper construction — makes it cost-effective over time.

Planning and Preparation

Design Considerations

  • Thickness: For standard passenger vehicles, 100mm (4 inches) is the typical minimum. For driveways that will see vans, SUVs, or occasional light trucks, 125–150mm is advisable.
  • Drainage: Plan a fall of at least 1:80 (1.25%) away from the house to direct rainwater to drains or a soakaway.
  • Joints: Control joints should be cut or tooled every 3–4 metres to guide cracking into straight, manageable lines rather than random fractures.
  • Expansion joints: Place expansion joint material where the driveway meets the house, garage, or any fixed structure.

Permissions and Regulations

In many jurisdictions, front driveways require planning permission, particularly regarding drainage. Check with your local authority before starting work. Permeable concrete or a suitable drainage strategy may be required.

Materials You'll Need

  • Concrete mix: C25 or C30 grade for driveways (order ready-mix for anything over 1–2 cubic metres)
  • Sub-base material: MOT Type 1 (crushed stone) or similar
  • Formwork: timber boards and stakes
  • Steel mesh reinforcement (A142 or A193)
  • Plastic spacers to elevate mesh off the ground
  • Expansion joint filler board
  • Release agent for formwork
  • Tools: screed board or straight-edge, bull float, hand float, edging tool, groove tool

Step-by-Step: Pouring the Driveway

  1. Excavate the area. Remove topsoil and any organic material to a depth of around 250–300mm below the finished surface level. Organic material under concrete causes differential settlement and cracking.
  2. Compact the sub-grade. Use a plate compactor on the exposed earth. Soft or unstable spots should be excavated and filled with compacted granular material.
  3. Lay the sub-base. Place and compact 150mm of MOT Type 1 granular material in layers. A well-compacted sub-base is the single most important factor in long-term driveway performance.
  4. Install formwork. Set timber boards to the correct finished level, following your planned falls. Stake securely. Apply form oil to the inside faces.
  5. Place expansion joints. Fix 10–12mm compressible joint filler board against the house wall and any abutting structures.
  6. Lay reinforcement mesh. Position steel mesh centrally in the slab depth using 50mm plastic spacers. Overlap mesh sheets by at least 200mm and tie with wire.
  7. Pour the concrete. For ready-mix, ensure your truck can get close enough. Discharge directly into the formwork and spread with shovels. Work quickly — concrete begins to set and workability decreases over time.
  8. Screed the surface. Use a straight screed board drawn across the top of the formwork in a sawing motion to level the concrete. Fill any low spots and re-screed.
  9. Float the surface. A bull float (large aluminium float on a long handle) is used after screeding to bring the surface to a smooth, closed finish. Work in overlapping passes.
  10. Cut control joints. Use a groove tool to cut joints to one-quarter of the slab depth at 3–4m intervals while the concrete is still plastic.
  11. Final finish. Apply a broom finish by dragging a stiff broom lightly across the surface for slip resistance. Alternatively, expose the aggregate for a decorative finish.
  12. Cure the concrete. Apply a curing compound immediately after finishing, or cover with wet hessian and polythene for a minimum of 7 days. Curing is critical for achieving design strength and surface durability.

When Can You Use the Driveway?

Avoid foot traffic for the first 24–48 hours. Keep vehicles off for at least 7 days, and ideally 28 days for full strength development. Heavy vehicles should wait the full 28-day curing period before use.

Common Mistakes to Avoid

  • Adding water to concrete on site to improve workability — this weakens the mix.
  • Pouring on frozen ground or in freezing temperatures without cold-weather precautions.
  • Skipping or under-compacting the sub-base.
  • Neglecting curing — a surface that dries out too quickly will be weak and dusty.
  • Omitting control joints, leading to uncontrolled random cracking.