Exposed aggregate concrete delivers the look of natural stone with the strength and low maintenance of a poured slab. We wash back the surface after the pour to reveal the stone embedded in the mix, creating a patio that grips wet feet, hides dirt and wear, and needs less frequent sealing than stamped alternatives. Start with a free site estimate.
How Exposed Aggregate Patios Perform in Pittsburgh Yards
The appeal of exposed aggregate lies in its balance. You get a decorative surface that looks like natural stone without the cost or installation complexity of real stone pavers. The concrete slab underneath is built on a solid base with proper slope for drainage, finished level, then the top layer is washed to expose the aggregate stones.
This finish excels in wet conditions. The textured surface provides genuine traction for bare feet coming from a pool or after rain, making it safer than smooth concrete or even broom-finished slabs. The stone texture also masks stains and weathering that would show on plain concrete, so the patio looks fresher longer between maintenance cycles.
Compared to stamped patio finishes, exposed aggregate requires less frequent resealing. The concrete patio base is identical in both cases, but the decorative approach differs. Where stamped requires tooling and pattern maintenance, exposed aggregate relies on the natural durability of embedded stone. For homeowners seeking outdoor living spaces that work hard without constant upkeep, this is the practical choice.
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Installation sequence
Pouring an Exposed Aggregate Patio, Step by Step
Site prep and base work
The area is excavated to depth, a compacted granular base is laid for drainage, and wooden or metal forms are set to establish the finished grade and slope away from structures.
Select aggregate and colour
You choose the stone size (fine pea gravel for subtle texture, larger stones for bold appearance) and concrete colour. We bring samples to show how combinations read in natural light.
Mix, place, and finish the slab
Air-entrained concrete is delivered and placed into the forms, screeded level, and allowed to set to the right stage. Timing is critical for the wash-back process.
Wash and seal the surface
Once the concrete has cured enough, the surface is carefully washed to remove the top layer of paste and reveal the aggregate. A protective sealer is applied to lock in colour and protect the stone.
Making the choice
Exposed Aggregate vs Other Patio Options
Three main decorative patio finishes compete for backyard space. Plain concrete patios are the most budget-friendly and require the least upkeep, but offer no visual interest. Stamped concrete mimics stone or wood patterns and looks striking when new, but the tooling adds cost and the pattern requires more frequent resealing to stay crisp.
Exposed aggregate sits in the middle. It costs less than stamped because there is no pattern tooling involved. It looks more refined than plain concrete because the stone is visible. And it needs less maintenance than stamped because the texture does not fade or wear away. If your patio gets heavy use from kids, pets, or pool traffic, the grip and durability make it the practical winner. For patio repair or resurfacing of an older slab, exposed aggregate is also a smart refresh option that can tie into walkways and sidewalks throughout the yard.
Answers to common questions about texture, grip, sealing and cost.
No, the opposite. The stone texture gives traction wet, which is why it is popular for patios that get pool splash, rain or morning dew. Much grippier than a smooth or even broom-finish patio.
Typically every three to four years in Pittsburgh, slightly less often than stamped patios but more often than plain concrete. The seal protects the spaces between the stones from water getting in.
Not when the patio is poured and sealed properly. The aggregate is embedded in the concrete matrix, not laid on top, so the stones are mechanically locked in. Sealing protects the matrix from freeze-thaw working stones loose.
Yes. The base concrete can be integrally coloured under the exposed surface, and the aggregate choice shifts the tone too. We bring sample boards so you can see combinations in daylight before the pour.
Exposed aggregate usually costs less than stamped concrete because the stamp tooling and labour are not part of the job. The trade-off is a different decorative style, texture from stone rather than pattern from a stamp.
Homeowner reviews
What Pittsburgh Homeowners Say About Their Exposed Aggregate Patios
Describe your backyard and the look you want. We will visit the site with aggregate samples, discuss stone size and colour options, and send a written estimate within one business day.
