Tearing Out Old Driveways in Buffalo, Down to Solid Ground

Why driveways fail from the bottom up

Blacktop is mostly a wearing surface, and even a thick concrete slab depends on even support underneath. The load ends up in the stone base and the soil beneath it, and that's where most driveways give out. Water gets in through cracks and along the edges, the fines in the base turn to paste, and every freeze lifts the wet spots a little more than the dry ones. After a few winters you see the familiar pattern: ruts in the wheel paths, a web of alligator cracking, slabs that rock or sit higher at one end.

A driveway built on a thin or dirty base can start showing that damage within its first couple of years. Overlaying it only buys time, because the old cracks work their way back up through the new layer. These signs say the base has to go, not just the surface:

• Alligator cracking in the wheel paths or near the garage door
• Low spots still holding water a day after rain
• Concrete slabs that have heaved, dropped or tipped toward the house
• Fine silt pumping up through joints and cracks after storms
• Crumbling edges where the stone underneath has washed away

When the real complaint is water running toward the garage or pooling along the foundation, the answer may include a drainage line or catch basin installed while the driveway is open, rather than a new surface alone.

Asphalt, concrete, or both: how each one comes out

Asphalt is the easier of the two. An excavator bucket gets under the edge and peels it up in slabs, and a sawcut along the sidewalk or street apron keeps the sections you're keeping from tearing loose with it. Residential blacktop is usually only a few inches thick, so it loads fast.

Concrete takes more work. It's thicker, heavier and often reinforced with wire mesh or rebar, so it gets cut into manageable sections and broken with a hydraulic hammer or the bucket before loading. Mesh and rebar hanging off the broken pieces get cut back so the loads stack in the truck and dump cleanly at the recycler. Where the driveway butts against a garage slab, a porch step or a sidewalk that stays, a full-depth sawcut matters, because a crack started by the breaker can run straight into the concrete you meant to save.

Then there's the driveway that looks like asphalt but isn't only asphalt. Plenty of older drives have blacktop laid right over the original concrete, sometimes with brick or pavers hiding at the edges. We plan for that layer cake when we walk the job, since it changes how much material comes out and how trucks get scheduled. If a tired detached garage at the end of the drive is coming down too, pairing the work with a garage tear-down means one mobilization and one cleanup.

Where the broken concrete and blacktop end up

Old driveway pavement doesn't have to go to a landfill. New York classifies it as construction and demolition debris, and DEC-registered processing facilities can accept clean, separated concrete (including the steel embedded in it), brick, rock, asphalt pavement and millings. Keeping loads clean is what makes that possible, so trash, wood and muddy spoil stay out of the pavement piles.

DEC's pre-determined beneficial uses spell out where that material can go next:

• Asphalt chunks and millings can go back to an asphalt manufacturing plant
• Ground or milled asphalt can become subbase, backfill for utility cuts, or part of a new pavement mix
• Crushed concrete, brick and rock can serve as aggregate or subbase
• Concrete can go to a ready-mix plant to become part of a new concrete product

A caution if you're hoping to crush your old driveway into your new base: recycled stone is only as good as the processing behind it. State highway work sets the bar, and NYSDOT takes recycled material in its subbase only when it holds a DEC beneficial use determination, appears on the department's approved list and meets the same gradation limits as the stone it replaces. Soil follows its own rules too. Registered facilities take excavated soil only when it shows no spill impacts, odors or other signs of contamination, so soil stained by years of dripping oil stays out of the clean loads and gets handled separately.

Rebuilding the base before your paver shows up

Once the pavement is gone, the ground tells you what the next driveway needs. Firm, dry subgrade may only need the old stone regraded and topped up. Soft clay that ruts under a loaded wheelbarrow, topsoil somebody paved over years ago, or stone that has turned to mud all come out until the bottom is solid.

The rebuild then follows a set order:

1. Probe or proof-roll the subgrade and undercut the soft spots
2. Lay geotextile fabric where wet clay would otherwise work up into the stone
3. Place crushed stone in lifts, compacting each one before the next goes down
4. Fine-grade the top with pitch toward the street or a drain, away from the house

For the stone itself, a handy yardstick is NYSDOT's Type 2 subbase: stone crushed from ledge rock (or an approved recycled equivalent), all of it passing a 2-inch sieve, with no more than 10 percent fines by weight. Angular, well-graded stone like that locks together under a compactor; round gravel and dirty fill don't knit together that way. Base depth depends on the soil and the traffic, and a drive that sees delivery trucks or a boat trailer needs more than one that parks a sedan.

If you'd rather finish in stone, or you want extra width, a parking pad or a culvert, that belongs to our driveway and parking lot construction work, and bigger elevation changes fall under site grading.

Aprons, curbs and the City's right-of-way permits

The last stretch of your driveway, from the property line out to the curb and across the sidewalk, belongs to the public right-of-way, and inside city limits it runs on separate rules. Under Buffalo's Green Code, cutting the curb or the pavement of a public right-of-way to reach a property takes a curb cut permit, which the City's public works commissioner decides. Any pavement disturbance in the right-of-way also needs a right-of-way work permit, the same permit that covers placing a dumpster there or crossing it with oversize equipment.

The City's curb cut application asks for a current survey plus a scaled drawing showing the cut against property lines, the house and the sidewalk, and it notes that the driveway or parking area itself needs a separate building permit from City Hall. A curb cut permit expires if the work isn't finished within a year of issuance and no extension was requested in time. Whether a same-size replacement of an existing apron needs every one of these is a question for DPW before the saw comes out, and we would rather ask than guess.

Outside the city line, apron and road-edge work answers to whoever owns the road, whether that's a town, a village, the county or the state, and each sets its own rules. Send the address through our contact page and we'll check which office controls that road before we price the rip-out. There's more on working within city limits on our Buffalo service area page.