Exposed Aggregate Concrete
June 1, 2025
Exposed aggregate is the finish you choose when you want texture, grip, and a natural look without a stamped pattern. The stones become the design — and the result is durable, slip-resistant, and attractive without requiring skilled pattern-stamping labor.
Pros
- +Natural slip resistance — no added texture treatment needed
- +Hides surface wear, tire marks, and minor imperfections
- +Wide range of stone and color options
- +No stamping labor premium
- +Works well around pools where wet barefoot traffic is common
Cons
- −Difficult to patch invisibly — repairs almost always show
- −Rough texture can be uncomfortable for barefoot use
- −Not compatible with snowblower blades (texture catches the blade)
- −Catches organic debris and requires frequent sweeping
- −Specialty aggregate significantly increases cost
How It's Made
Concrete is poured with a specified aggregate mix (pea gravel, river stone, crushed granite, or recycled glass). Before the surface fully cures, a surface retarder is applied to slow the top layer. Once the bulk of the slab has set, the top paste is washed away with water and a stiff brush, exposing the aggregate below. The stones are revealed but held permanently in the concrete matrix.
Aggregate Options
The choice of stone determines the look. Pea gravel (small, rounded, earthy tones) gives a warm, natural finish. River stone (larger, mixed tones) reads as bold and natural. Crushed granite or quartz produces a sharper, more contemporary look. White quartz or marble aggregate creates a light, bright surface that pairs well with modern landscaping. Recycled glass aggregate (blue, green, clear) is a specialty option that catches light dramatically.
Cost
Exposed aggregate runs $8–14 per sq ft installed — less than stamped concrete ($12–18) but more than plain broom finish ($6–10). The aggregate type affects the high end of the range: standard pea gravel is at the lower end; specialty stone or recycled glass pushes toward $14+. For a standard two-car driveway (400 sq ft), budget $3,200–5,600.
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Best Applications
Driveways: the texture handles tire traffic well and disguises oil marks better than smooth concrete. Pool decks: stays cooler underfoot than dark surfaces, provides natural slip resistance when wet. Patios: works particularly well in natural garden settings where the organic stone look ties into the landscape. Less suited to spaces where people walk barefoot frequently — the texture can be uncomfortable on bare feet.
Maintenance
Seal the surface after installation and every 2–3 years thereafter. A penetrating sealer (not a film-forming one) preserves the texture while protecting against staining. Avoid de-icing salts in the first few winters — chlorides degrade concrete from the surface. Pressure washing is effective for cleaning; avoid very high-pressure settings that can dislodge smaller aggregate particles over time.
Limitations
Patching exposed aggregate is difficult: new concrete poured to match an existing surface will differ in stone size, distribution, and color. This means damage repair is almost always visible. The texture also catches dirt and organic debris more than smooth concrete, requiring more frequent sweeping. In climates with heavy freeze-thaw cycles, air-entrainment in the mix and proper sealing are essential.
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