Exposed aggregate concrete driveways
In short
A concrete slab with its surface washed back to reveal the stone in the mix — a naturally textured, hard-wearing, non-slip finish with no coloured coating to fade and no annual comparison with how it looked when new. It is the quiet, low-maintenance end of decorative concrete.
Also called: Washed aggregate concrete · Exposed stone concrete drive · Aggregate finish concrete · Brushed aggregate driveway
Signs you need this
- Wanting decorative concrete without an ongoing sealing commitment
- A sloping or shaded drive where grip matters
- Disliking the look of stamped patterns
- A modern house where a natural stone texture suits the frontage
- Preferring something that ages rather than fades
- An exposed site where a coated surface would weather badly
Exposed aggregate is a concrete drive finished differently rather than a different material. A surface retarder is applied to the fresh slab to hold back the cement paste at the very top, and the following day the surface is washed and brushed to expose the aggregate underneath. What you end up with is the stone in the concrete itself, presented as the wearing surface.
The advantage that matters is that there is nothing on the surface to wear off. Imprinted concrete relies on a colour hardener and a sealer; painted or coated surfaces rely on the coating. Exposed aggregate relies on the stone, which is the most durable part of the concrete and is not going anywhere. It ages by getting slightly cleaner or dirtier rather than by fading, and a twenty-year-old exposed aggregate drive looks like an exposed aggregate drive.
It has genuinely good grip, because the exposed stone gives a naturally textured, high-friction surface. On a falling drive, or a shaded north-facing one that stays damp through the winter, that is a real safety argument — and around here, on the ground rising east of the town where slopes are common and frost more frequent than on the plain, it is worth weighing.
The look is decided by the aggregate, which is where the design happens. A standard mix gives a grey, gravelly finish. Specifying the aggregate — a golden gravel, a granite, a basalt, a mixed river stone — changes the character completely, and it is worth seeing a sample panel poured rather than choosing from a photograph, because the depth of exposure changes the appearance as much as the stone does.
The timing is the skilled part. Wash too early and the aggregate is undermined and comes loose; wash too late and the retarder has been overtaken and the paste will not come off. That window depends on the weather, the mix and the retarder, which is why it is a job for somebody who has done it before and why a hot day or a sudden downpour can be a genuine problem. It is not a finish to attempt on a marginal forecast.
Everything else about it is a concrete drive and carries the same rules. Thickness and reinforcement to suit the loading, control joints designed and cut so the slab cracks where you decided, proper curing, and — because it is impermeable — drainage designed to satisfy the front-garden planning rule. Sealing is optional here rather than essential: a sealer deepens the colour of the stone and helps with staining, but the surface works perfectly well without one, which is the opposite of the imprinted position.
What the job covers
- Excavation, compacted sub-base and reinforced slab as for any concrete drive
- Aggregate chosen and, where wanted, a sample panel poured first
- Control joints designed and cut at the right spacing
- Surface retarder applied evenly to the fresh slab
- Wash and brush timed to the weather and the mix
- Falls set away from the building and the garage
- Proper curing after exposure
- Optional sealer to deepen the stone colour, not to protect a coating
What it costs
We don't publish a price for this yet, because a number pulled out of the air is worse than no number at all — your contractor has to honour it. On driveways it would also be close to meaningless: the groundworks are usually the biggest single factor, and how deep the dig has to go varies enormously house to house. You'll get a firm price for your actual job when they ring you back, before any work starts. The quote itself is free and there's no obligation either way.
Common questions
Does exposed aggregate need sealing?
Not in the way imprinted concrete does. A sealer deepens the colour of the stone and makes cleaning easier, but the surface is durable without one because the wearing surface is aggregate rather than a coating. That is the main practical advantage over imprinted concrete — there is no three-to-five-year commitment built into it.
Is it rough underfoot?
It is textured rather than rough, and the depth of exposure controls how much. A light exposure gives a subtle texture suitable for bare feet around a pool; a deeper exposure gives more grip and a more pronounced look. It is worth agreeing the depth on a sample panel, because it is not something that can be changed once the slab is washed.
Can it be laid in any weather?
No, and this is the one finish where the forecast genuinely governs the date. The wash-off has to happen in a fairly narrow window after the pour, and heavy rain, strong sun or frost in that window can ruin the finish. A contractor who postpones an exposed aggregate pour because of the weather is doing the right thing.
How does it compare with imprinted concrete?
Same slab underneath, different surface philosophy. Imprinted gives more decorative variety and a laid-unit look, and requires resealing every few years. Exposed aggregate gives a natural stone texture, better wet grip and essentially no maintenance commitment. Neither can be patched invisibly, and both are impermeable and need drainage designed in.
Need this doing in Macclesfield?
Tell us the job and it goes straight to our local contractor — one call back, usually the same day. Free quote, no obligation.