Concrete Paving

Concrete Driveways

A residential concrete driveway in NC is either 4 inches thick with welded wire mesh (for standard passenger cars and light SUVs) or 5-6 inches thick with #4 rebar on 18-inch centers (for anything that will regularly hold a diesel pickup, delivery truck, RV, or trailer). Getting that call wrong is the number one cause of cracked driveways in the Piedmont — a 4-inch slab under a diesel dually or a 12,000-lb Class C motorhome will crack inside 5 years even if everything else is done right.

At the apron — where the driveway meets the street — the slab thickness usually steps up an extra inch because that's the highest-stress zone (vehicles accelerating and braking while the slab is cantilevered slightly at the curb cut). NCDOT-permitted aprons in Charlotte, Raleigh, and most municipalities have their own thickness and reinforcement spec that has to be followed.

Long rural driveways (over 100 ft) sometimes come in slightly lower per SF because the crew can spend a full day on a single pour, and short tight-access driveways sometimes come in higher because they need a concrete pump.

Concrete Slabs — Garages, Workshops, Metal Buildings

A concrete slab is a paved concrete floor built to hold static loads (parked vehicles, workshop equipment, storage racks, generator anchors) rather than rolling loads. A residential garage slab is usually 4 inches with welded wire mesh. A workshop slab or garage-with-a-lift steps up to 5-6 inches with a #4 rebar grid. A slab under a 40x60 metal building runs 5-6 inches with a rebar grid tied into perimeter footings, per the building manufacturer's foundation drawings.

On any interior slab in NC, the base gets a 6-mil poly vapor barrier under the concrete to block moisture rise from Piedmont clay — skipping the vapor barrier is why so many older garage slabs have that permanent damp patch on the surface. Exterior slabs (parking pads, patios, exterior storage slabs) usually don't need the vapor barrier.

Anything larger than about 30x40 usually drops the per-SF cost slightly because of the crew-day efficiency.

Concrete Pads — Sheds, Hot Tubs, Generators, HVAC

Small concrete pads are one of the most common calls we get from homeowners across the Charlotte and Raleigh metros. A concrete pad for a shed is typically 4 inches thick with wire mesh, sized 1-2 ft larger than the shed footprint in each direction, poured with a broom finish. A pad for a hot tub carries concentrated wet weight and usually runs 4-6 inches with a #4 rebar grid, sized several inches larger than the tub footprint. A pad for a whole-house generator or an HVAC unit is smaller — 4 inches with mesh, sized to the manufacturer's spec, usually placed near the utility connection.

For small pads, the base prep matters just as much as it does on a driveway. 4 inches of compacted ABC stone in 2-inch lifts, a level graded surface, and drainage away from any building — those three details are what keep a shed pad from settling into the yard after two winters.

Delivery minimums on the concrete truck can push very small pads higher on a per-SF basis because a 3-yard minimum applies whether you need 1 yard or 3.

Concrete RV Pads

A concrete RV pad is heavier-duty than a residential driveway because an RV parked in the same spot for weeks or months applies concentrated jack-stand and tire loads to the same square feet of concrete for the entire storage period. Standard spec across NC: 6 inches thick, #4 rebar on 18-inch centers in a grid, poured over 6 inches of compacted ABC, sized 12 ft wide by 30-45 ft long for a standard RV (larger for a Class A motorhome or a fifth wheel with a truck attached).

The grade is critical. An RV pad has to shed water in a controlled direction — usually a 1-2% cross slope away from the RV storage side toward a swale or drain. Standing water under the jack stands is one of the fastest ways to spall a slab in NC's freeze-thaw pattern. Many RV pads also get 30-amp or 50-amp electrical stub-ups poured into the slab at the utility connection point.

That's more per SF than a regular driveway because of the doubled thickness, doubled reinforcement, and deeper base — but the pad lasts decades under heavy-load use where a 4-inch driveway slab would crack in the first few winters.

Concrete Paving Cost — What Actually Drives the Number

Concrete paving quotes vary by more than just square footage. The biggest cost drivers, roughly in order of impact on the final number:

When comparing two quotes, the useful move is to line up these specs side-by-side. If two quotes have very different totals but the specs match, that's a real price comparison. If the specs are different, the quotes aren't for the same job — even when the square footage matches.

Concrete Paving vs Other Paved Surfaces

Concrete paving is one of several options for a paved surface. Asphalt paving is cheaper up front but has a shorter useful life and needs a seal-coat every 2-3 years. Pavers (concrete or clay pavers set on a sand bed) look premium but have higher installed cost and more maintenance. Gravel is the lowest first-cost option but re-grades every few years and doesn't hold up under regular vehicle turning stress.

In NC specifically — with the freeze-thaw pattern, the Piedmont clay soil, and the humidity — poured concrete is the longest-lasting option for driveways, slabs, pads, and RV storage areas. That's why most residential and commercial paving in the Charlotte metro, the Triangle, and the Triad ends up in concrete rather than asphalt when the property owner is planning to hold the property long-term.

The two questions worth thinking through before committing to concrete paving: is the driveway or pad going to be in the same spot 10+ years from now (concrete rewards long holds), and does the site have any complications that make a poured pour hard (very steep grades over 12%, no truck access at all, or a soil report showing expansive clay that needs specialized foundation design)?

How to Read a Concrete Paving Quote

A quote worth taking seriously spells out, in writing:

- Dimensions and total square footage - Slab thickness in inches (and where it steps up — aprons, garage entrances, apron-to-street transitions) - Reinforcement type and spacing (welded wire mesh vs #4 rebar on X-inch centers) - Base prep depth and material (typically 4-6 inches of NCDOT ABC compacted in 2-inch lifts, geotextile fabric on clay-heavy sites) - Existing surface demolition and haul-off (if applicable) - Grade and drainage plan (which direction water sheds, any trench drains or catch basins) - Finish (broom, stamped, exposed aggregate, salt, custom) - Joint pattern and control-joint cut timing (usually within 24 hours of pour, at 24-30 times the slab thickness) - Concrete cure window before the paved surface can be driven on (7 days for cars, 14-28 for heavy vehicles) - Sealer application and schedule

A quote that only lists total dollar amount and square footage without the spec detail leaves too much unspecified. Ask any paving contractor for the missing line items before comparing bids — that's where the actual price difference usually lives.

Best Time of Year to Pour Concrete Paving in NC

Concrete paving pours across NC year-round. The ideal placement temperature is between 50°F and 85°F with no rain in the forecast for the first 24 hours after the pour, which lines up with spring and fall for most projects. Summer pours are common but usually get scheduled for the early morning so the concrete isn't setting through the hottest part of the day — hot-weather pours use retarders in the mix and often get sprayed with an evaporation retardant during finishing.

Winter pours in NC are workable most days but need to avoid overnight lows below 40°F for the first 24-48 hours after placement. Concrete cures through a chemical reaction that essentially stops if the mix freezes before it hardens. Cold-weather pours use insulating blankets over the fresh concrete for the first day or two.

A concrete paving project rarely has to be delayed by season in NC — it usually just requires the right timing within the day and the right precautions for the weather. The one exception is heavy rain: no legitimate concrete crew will pour into standing water or through active rainfall because it dilutes the surface and ruins the finish.