Straight Answers
A residential concrete driveway in Winston-Salem, NC should be 4 inches thick, poured over roughly 4 inches of compacted aggregate base. Go to 5 or 6 inches if the drive will regularly carry heavy vehicles: work trucks, loaded trailers, an RV. The maths on thickness is simple, because concrete is priced by volume: moving from 4 to 5 inches puts about 25 percent more concrete in the same footprint. What thickness cannot do is compensate for a poor base, which decides more about how long a driveway lasts than any other single factor.
Updated Aug 17, 2026 · Winston-Salem Concrete Co, Winston-Salem, NC
Thickness follows load. These are the standards we quote against in Forsyth County and the surrounding towns.
| What it carries | Thickness |
|---|---|
| Sidewalks and walkways | 4 inches |
| Patios | 4 inches |
| Driveway, passenger cars | 4 inches |
| Driveway, work trucks or trailers | 5 inches |
| Driveway or pad, RV, boat, heavy equipment | 6 inches, reinforced |
| Garage and shop floors | 4 to 6 inches depending on use |
A 6 inch slab on a soft base will fail before a 4 inch slab on a properly compacted one. The base spreads every load the slab carries into the ground beneath it, and in the Piedmont that ground is usually red clay, which holds water and moves as it wets and dries.
That is why a serious quote talks about base preparation before it talks about concrete. Compacted aggregate, correct grade, and drainage that moves water away from the slab are what the thickness sits on.
Not across the whole drive, usually. Common practice is to thicken the specific zones that take the abuse: the apron where the driveway meets the street, the edges, and any pad where a heavy vehicle parks. That targets the extra concrete where the load is instead of spreading it across square footage that only ever sees a sedan.
Two quotes on the same driveway can hide different slabs. One may be 4 inches unreinforced on the existing grade, the other 5 inches with wire over a rebuilt base. The thinner quote is cheaper and can also be the right call, but you cannot compare them until both state thickness, reinforcement, and base preparation in writing.
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