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Half the driveways in this city sit on a grade steep enough to make winter a daily judgment call. Exposed aggregate was made for exactly that problem. It’s ordinary structural concrete with the top skin of cement paste washed off, so the stone inside ends up sitting proud at the surface.

What you get is grip you can feel underfoot and a natural, stone-forward look that never flattens out into plain gray. We pour it for new driveways and full replacements, and carry the same blend across aprons, walkways, and garage approaches throughout the Pittsburgh area.

Pittsburgh doesn’t do flat. Driveways in Mt. Washington, Brookline, Beechview, Troy Hill, and half of Squirrel Hill run at grades that would be considered a hazard in most cities. On a pitch like that, surface texture stops being a style choice and becomes a safety one.

Protruding stone gives tires and shoes something to bite into. A smooth or lightly stamped surface can turn slick under wet leaves, morning frost, or a thin melt-and-refreeze layer — the exact conditions we get from November through March. The raised profile also breaks up sheeting water instead of letting it glaze across the slab.

That said, no surface is grip-proof when ice forms on top of it. What this finish does is give you a meaningfully better starting point than a polished one, especially on a grade where you’re reversing uphill in the dark.

The stone you pick sets the entire personality of the driveway. River rock reads soft and rounded. Crushed granite looks sharper and more modern. Quartz brings a bit of sparkle in direct sun, while limestone and darker basalt-tone blends stay quiet and neutral against brick or stone facades.

Exposure depth is the second lever, and it’s the one most homeowners don’t know they have. A light exposure leaves a fine, sandy texture that’s barely more aggressive than a broom finish. Medium exposure is the usual choice for driveways — clear stone definition with a comfortable walking surface. Deep exposure pushes the rock well above the paste for a bold, riverbed look.

Sealer choice finishes the picture. A wet-look sealer deepens the stone colors and makes the whole surface pop, while a matte sealer keeps things flat and natural. We can carry the same blend across your apron, front walk, and steps so the entryway reads as one piece instead of three separate pours.

People search this phrase meaning two very different things, so it’s worth separating them. The base is the compacted crushed stone layer beneath the slab — typically a graded stone like #2A — and it’s structural, not decorative. You never see it once the pour is done.

A “big aggregate” look, on the other hand, is a deep-exposure finish using larger river rock or oversized decorative stone at the surface. If you want chunky, visible rock, you’re describing the finish. If you’re asking what keeps the slab from settling, you’re describing the base. Both matter, but they’re separate decisions.

The cement paste around each stone is what holds everything in place, and three things attack it: freeze-thaw pressure, chloride de-icers, and high-pressure washing. Understand those three and your driveway will outlast most of the ones on your street.

Plan on resealing roughly every two to three years. Penetrating sealers soak in and block moisture without changing the look, while acrylic topical sealers sit on the surface, add sheen, and help hold stone that’s beginning to loosen. On a sloped drive with heavy winter exposure, that shorter reseal cycle is money well spent.

Skip rock salt. Chloride-based melters dissolve surface paste and accelerate freeze-thaw damage, and popped stone along the wheel paths is the usual result. Sand gives traction without the chemistry. Use a plastic shovel or a poly-edge plow blade, and keep the pressure washer dialed down — stripping paste is far easier than putting it back.

Your driveway stops being yours at the property line. The apron — the section running from there out to the street — sits in the public right-of-way, and it follows municipal rules rather than homeowner preference.

Inside city limits, curb cuts and right-of-way work go through the Department of Mobility and Infrastructure. Surrounding municipalities including Mt. Lebanon, Ross, Bethel Park, and Cranberry Township each maintain their own apron and approach specifications, and they don’t all match.

We identify the apron line during the on-site assessment and confirm what applies at your address before scheduling, so the street-side transition doesn’t become a problem after the pour.

Nothing gets quoted from a satellite image. We come out, walk the driveway, check how it drains, look at the grade, and talk through what the finish will actually look like against your house before numbers enter the conversation.

You’ll also get a straight answer about whether this is the right finish for your property. On a shaded, tree-heavy lot where organic staining is constant, or on a flat drive where traction isn’t a concern, we’ll say so and point you toward a finish that fits better.

The details we obsess over are the unglamorous ones — base compaction, drainage pitch, joint layout, and exposure timing. Those are what determine whether the driveway still looks right in year ten, and they’re where this finish is most often rushed.