Exposed Aggregate Concrete: Look, Cost, and Care
Exposed aggregate concrete is a finish in which the top layer of cement paste is removed to reveal the stones in the mix. The result is a pebbly, textured surface that hides dirt, resists slipping, and offers color variety through the choice of aggregate. It is popular for driveways, patios, pool decks, and sidewalks. Cost usually sits between plain broom-finished concrete and stamped concrete.
Concrete calculator →How it is made
- Concrete is placed using a mix with attractive aggregate, or decorative stone is seeded onto the surface.
- The surface is floated to embed the stones.
- A surface retarder may be sprayed on to slow setting of the top layer.
- Paste is washed and brushed away at the right time, often hours later or the next day, exposing the tops of the stones.
- The slab cures, then is cleaned of haze and often sealed.
Timing matters: wash too early and stones pop loose; too late and the paste is hard to remove.
Aggregate choices
- River rock or pea gravel for rounded, smooth stones.
- Crushed granite or quartz for color and sparkle.
- Local gravel for an economical natural look.
- Glass or shells in specialty decorative work.
Pros and cons
| Pros | Cons |
|---|---|
| Slip resistant, good for pool decks and slopes | Rough on bare feet and knees with some stones |
| Hides stains and dirt | Harder to repair invisibly |
| Durable surface | Stones can loosen if poorly installed |
| Decorative without stamping | Needs sealing to stay vibrant |
Cost
Exposed aggregate often costs more than plain broom finish because of extra labor and decorative stone, and often less than detailed stamped concrete. Local labor rates and stone choices drive the price. See stamped concrete cost and cost to pour a concrete slab.
Sealing and maintenance
Sealing enhances stone color and helps resist stains and water. Acrylic sealers are common for a wet look; penetrating sealers keep a natural appearance. Reseal every few years as the finish wears. See concrete driveway sealer types.
Clean with a stiff brush and mild detergent; avoid high pressure that can loosen stones.
Exposed aggregate vs broom finish
Broom finish is simpler and cheaper and offers good traction. Exposed aggregate offers more visual interest and slightly better slip resistance in many cases. See broom finish concrete.
Bottom line
Exposed aggregate concrete reveals decorative stones for a textured, slip-resistant, low-maintenance look, typically costing more than broom finish but often less than stamped concrete. Good timing during installation and periodic sealing keep it looking its best.
Questions people ask
What is exposed aggregate concrete?
Concrete with the top paste removed to reveal the stones in the mix.
Is exposed aggregate slippery?
It is generally slip resistant, which makes it popular for pool decks and slopes.
Does exposed aggregate need sealing?
Sealing is recommended to enhance color and resist stains.
Is exposed aggregate more expensive than regular concrete?
Usually yes, because of extra labor and decorative stone.
Can stones come loose from exposed aggregate?
Poor timing or installation can lead to loose stones. Avoid aggressive pressure washing.
Related guides
- Stamped Concrete Cost per Square Foot
- Broom Finish Concrete: Timing, Texture, and Tips
- Concrete Driveway Sealer Types Compared
- Cost to Pour a Concrete Slab: Per Square Foot
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