Driveway repair – aggregate, drainage, layers and quantities

Inspect the driveway in dry and wet conditions

Mark potholes, wheel tracks, soft patches and places where damage returns. After rain, look for standing water and routes where surface material has washed away. Compare damaged places with sound parts of the drive.

These observations suggest what to investigate; they do not establish the buried construction on their own. More than one problem can affect the same patch.

A surface repair may be enough

Where damage is shallow and the structure underneath is sound, the work may be limited to reshaping the surface and replacing missing material.

Check the intended level against sound areas, entrances and the water route. Choose the replacement material for its job in the existing construction, using the supplier's grading and intended-use information. A product sold as gravel, crushed rock or decorative stone is not automatically interchangeable with another.

Shape the repaired surface and follow the material's working instructions. Before finishing, check that the patch has not become a new hollow that will collect water.

Water keeps bringing the damage back

Repeated washout, standing water or a muddy accumulation of fines calls for a drainage check before more surface aggregate.

Trace where the water arrives from. Check existing drains, ditches or outlets for blockages and whether the surface shape prevents water from leaving. Deal with the identified blockage or level problem within the scope of the repair before the final surface layer. If a new drainage arrangement is needed, resolve it separately before ordering aggregate.

Adding a layer over wet material or aggregate mixed into the underlying soil can leave the same problem in place. A fresh surface does not automatically change the water route.

The ground or base is giving way

Deep deformation, repeated sinking in the same position or a soft foundation suggests that surface patching will not be enough. Establish how far the damage extends and which part of the structure needs attention. Seek a site-specific assessment if that cannot be resolved.

Do not select a base depth from a generic centimetre figure. Ground conditions, water and traffic loading determine the repair. The name of the new surface aggregate does not answer those questions.

Order only the layers being repaired

Measure the repair area rather than automatically using the whole drive. Count only missing material or a layer that will actually be replaced.

Hypothetical quantity example: 12 m × 3 m = 36 m². A planned 15 cm finished structural layer gives 5.4 m³. A separate 5 cm finished surface layer gives 1.8 m³. This is arithmetic, not a requirement to install both layers in every repair.

Keep finished geometric volume separate from the loose delivery quantity. Ask the supplier for the selected product's conversion to the planned finished layer. An unrelated loose density cannot turn compacted volume directly into a reliable order in tonnes.

Move to final surfacing when the water route and underlying problems have been resolved and repaired levels and intended layers have been checked. A fresh-looking surface alone does not show that the foundation is sound.