What Is Exposed Aggregate Concrete?

Definition

Exposed aggregate is a decorative concrete finish. The concrete is poured like normal, then the very top layer of cement paste is washed or ground back before it fully hardens, revealing the stones (the “aggregate”) mixed through it. The result is a textured, speckled surface rather than a smooth grey slab.

Why it matters

The finish isn’t just for looks. Exposing the stone gives the surface natural grip and makes it hard-wearing, so it holds up to cars, foot traffic and weather. It’s a popular way to lift the appearance and value of a property without a separate surface layer that can wear or lift over time.

Key points

• The stone can be chosen to suit the look you’re after, and different colours and sizes give very different results.
• It’s naturally slip-resistant, which suits driveways, paths and pool surrounds.
• It’s sealed after finishing to protect the colour and make it easier to clean.
• It typically costs a little more than plain concrete for the decorative finish.