What Exposed Aggregate Is
Exposed aggregate concrete is poured with decorative stone mixed through it. After the pour, the top layer of cement paste is washed away to reveal the stone underneath — a natural, textured surface that looks like a riverbed frozen in place. You choose the stone: pea gravel for a classic look, larger decorative rock for more drama, local tones to match the house.
Why Homeowners Choose It
It sits in the sweet spot between plain and stamped. More visual interest than broom-finish, less cost and less maintenance than stamped — and the exposed stone gives it natural traction that sealed stamped concrete cannot match. Around pools, on sloped driveways, and on walkways that get wet, that grip matters. It also hides dirt and wear better than any other finish.
Where It Shines
- Pool decks. Cool underfoot, grippy when wet, and the texture looks right next to water.
- Sloped driveways. Traction you can count on in rain and ice.
- Patios. A natural stone look without the cost of real flagstone.
- Walkways. Texture that stays attractive with almost no maintenance.
Built Like All Our Concrete
The finish is decorative; the slab is structural. Exposed aggregate goes on the same foundation as everything we pour: compacted stone base over the clay, 4,000 PSI air-entrained concrete, proper thickness, joints cut right, water sloped away. The pretty surface lasts because the slab underneath is built to last.
Care and Cost
Exposed aggregate asks for little — an occasional sealing every few years keeps the stone's color rich and blocks water. It typically costs more than plain broom-finish and less than stamped. Get a written quote for your project.
How the Stone Gets Revealed
The reveal is the delicate part of an exposed aggregate job. The concrete is poured with the decorative stone mixed through the batch — pea gravel, river rock, or a custom blend you choose from samples. Then timing takes over: a surface retarder is sprayed on to slow the set of just the top skin, and hours later the surface is washed with water to remove the cement paste and expose the stone. Wash too early and stones dislodge; too late and the paste will not release. After the wash, the surface cures and gets sealed, which deepens the stone's color and locks everything in. Done right, the result looks like a natural stone bed — every stone set flush, none loose, the surface uniform across the whole pour.
Our Process: Stone Selection to Sealed Surface
- Stone selection. We show you aggregate samples — sizes, colors, blends — and help you match the house. Earth tones for brick, grays for siding and stone veneer. You approve the blend before we order.
- Base and forms. Full structural prep: excavation, compacted stone base, forms set to the layout. The decorative finish never changes the structural spec.
- Pour. 4,000 PSI air-entrained concrete with your chosen aggregate placed, screeded, and finished flat. Joints are cut or formed to suit the layout.
- Retard and wash. Surface retarder applied at the right moment, then a careful wash to expose the stone evenly — the step where experience matters most.
- Cure and seal. After curing, a sealer coat enriches the stone color and protects the surface. With sealer and basic care, the finish holds its look for many years.
What Exposed Aggregate Costs in Fairfax County
Exposed aggregate typically costs more than plain broom-finish and less than stamped concrete — the decorative stone and the reveal process add material and labor, but less than full stamping. Most residential projects fall in the $5,000 to $15,000 range depending on area and stone choice. Sealing every few years keeps the color rich; that maintenance is modest. Get a written estimate — free — and see exactly what your project runs.
Exposed Aggregate vs. Stamped: Making the Call
These are the two decorative finishes everyone compares, and the choice comes down to priorities. Stamped wins on visual drama — bold patterns, rich color, the look of laid stone. Exposed aggregate wins on practicality — better natural traction, lower maintenance, and a surface that hides wear gracefully. Around pools and on slopes, aggregate's grip settles the argument. For a front driveway where curb appeal is the whole point, stamped usually wins. For a backyard patio that gets daily family use, aggregate is the workhorse that still looks good. Cost-wise, aggregate typically lands between plain and stamped. And both go on the same structural slab — the finish is a choice about looks and lifestyle, not about strength.
Aggregate and Fairfax Winters
Exposed aggregate handles freeze-thaw well — the stone itself is unaffected by cold, and the concrete between the stones is the same air-entrained mix we pour everywhere. The maintenance is simple: reseal every 3 to 5 years to keep the stone's color rich and the surface protected. Use de-icers normally after the first year; the texture gives you more grip than most finishes, which is exactly why it is popular on sloped driveways and pool decks.