Exposed Aggregate Driveways in Melton

How the finish is actually achieved

The concrete is placed and finished conventionally, then a surface retarder is applied to slow the set of the top few millimetres only. Once the slab beneath has hardened enough, the surface is washed with pressure to remove the retarded paste and expose the stone.

The whole technique lives or dies on timing. Wash too early and you strip too deep, pulling stones out and leaving a rough, pitted surface. Wash too late and the paste has gone off, leaving a patchy half-exposed finish that cannot be corrected afterwards. The window shifts with temperature, wind and humidity, which is why exposed aggregate on a hot, windy Melton day in February needs different handling from the same mix in July.

Choosing the aggregate

The stone determines the look. Larger aggregate reads as bolder and more textured; smaller stone gives a finer, more uniform surface. Local bluestone-based mixes suit the charcoal-and-render palette common in the corridor's newer homes, while lighter granites and quartz blends lift a darker facade.

Two practical notes. Order the whole driveway from one batch and one source where possible, because stone varies between batches and the difference shows. And look at a sample outdoors when wet as well as dry — exposed aggregate darkens noticeably in the rain and the wet appearance is a large part of how you will see it.

Cost against plain concrete

Expect exposed aggregate to run meaningfully above plain reinforced concrete per square metre. The extra covers the aggregate itself, the retarder, the wash-off and waste handling, and the additional labour and risk of a finish that has one chance to be right.

Sealing is an ongoing cost people forget. A sealed exposed aggregate driveway looks better, resists staining and sheds oil, but the seal needs redoing periodically — typically every few years depending on traffic, sun exposure and the product used.

How it behaves on Melton's clay

The finish is cosmetic; the structure underneath is what determines whether the driveway survives. On reactive volcanic-plain clay that means proper base depth and compaction, correctly placed reinforcement, and control joints spaced for the conditions.

There is one Melton-specific consideration worth knowing: a crack in exposed aggregate is considerably harder to repair invisibly than a crack in plain concrete, because any patch has to match both the colour and the stone exposure. Spending on the base is more important here than on a plain slab, not less.

Where the finish has to stop

Decorative finishes within the road reserve — the crossing itself — need council approval, and what is permitted differs from what you may do on your own land. Some homeowners run exposed aggregate the full length and some are required to finish the crossing in plain concrete to council's standard. Confirm this with Melton City Council before ordering, because it changes both the appearance and the quote.

Getting started

Tell us the area, the facade colours and whether your estate has design guidelines. We will suggest two or three aggregate options that suit, and quote them against plain concrete so you can see the real difference.