Exposed Aggregate Concrete in Gaithersburg, MD

Exposed aggregate is a decorative concrete finish where the top layer of cement paste is removed to reveal the stone aggregate beneath. The visible stone gives the surface a natural, textured appearance that is different from a plain broom or trowel finish. The texture also adds traction, which is one reason exposed aggregate is used on driveways, walkways, and pool decks where a non-slip surface matters.

The finish is valued for both appearance and function. The stone provides visual interest and a durable wearing surface, while the concrete underneath supplies the structural base. Exposed aggregate can be used across an entire surface or as an accent, border, or contrast area alongside standard concrete.

Because the aggregate is exposed, the surface is naturally rougher than smooth concrete. That texture is part of the appeal — it provides grip and a decorative look — but it also means the surface behaves differently under foot traffic, cleaning, and maintenance than a smooth slab.

Exposed aggregate suits a range of exterior surfaces where a decorative, textured finish is desired.

Common Applications

• Patios where a decorative, textured surface enhances outdoor living areas
• Walkways and paths that benefit from added traction and visual interest
• Driveway accents or full driveways where a durable, decorative surface is wanted
• Pool deck areas where a textured, slip-conscious surface is useful
• Entry areas and front walks where curb appeal matters
• Borders and contrasting sections alongside standard or stamped concrete
• Outdoor living areas combining decorative finishes with functional surfaces

Exposed aggregate can be used as the primary surface or as a complement to other finishes. A patio might pair an exposed aggregate border with a stamped interior, or a driveway might use exposed aggregate for the entire vehicle surface. The choice depends on the look, use, and site.

Installing exposed aggregate involves the same base preparation as any concrete pour, plus an additional surface-exposure step that reveals the stone.

1. 1Base preparation — excavate, compact the subgrade, and prepare a stable base.
2. 2Forming — set forms to the layout, dimensions, and finished elevation.
3. 3Concrete placement — pour and spread the concrete containing the selected aggregate.
4. 4Aggregate selection and integration — the stone type and size are part of the mix design.
5. 5Surface exposure — at the right stage of setting, wash away the top layer of paste to reveal the stone.
6. 6Washing and finishing — clean the exposed surface and tool the edges.
7. 7Joints — place control joints to manage cracking.
8. 8Curing — allow the concrete to gain strength before use.
9. 9Sealing where appropriate — apply a sealer to protect the exposed stone and surface.

We do not claim a specific proprietary technique. The exposure process is timed to the setting of the concrete, and the depth of exposure is controlled by how much paste is washed away. The aggregate size and stone type come from the mix, and the overall result depends on the materials, timing, and finish work.