Short answer
A residential asphalt driveway should have 2 to 3 inches of compacted hot-mix asphalt over 4 to 6 inches of compacted crushed stone. Driveways that carry work trucks, RVs or delivery traffic need 3 inches or more of asphalt, and soft or wet ground calls for 6 to 8 inches of stone.
Most people ask about the asphalt. The better question is the stone underneath it, because that is where driveways fail.
Asphalt and base, by driveway
| Driveway | Compacted asphalt | Compacted stone base |
|---|---|---|
| Cars only, firm well-drained ground | 2 to 3 inches | 4 to 6 inches |
| Work truck, RV, trailer or box truck | 3 inches or more | 6 inches or more |
| Soft, wet or low-strength ground | 2 to 3 inches or more | 6 to 8 inches, often with fabric under it |
Every number there is after compaction. A contractor can spread four inches of loose asphalt and roll it down to under three, so ask for the compacted thickness in writing.
Why the base matters more
Asphalt is flexible. It bends with whatever is underneath it, so a thin, soft or wet base lets the surface rut, sink and crack no matter how much asphalt went on top. A proper stone base spreads the weight of the car out, drains water away from the asphalt and keeps frost from lifting it.
That is also why thickness depends on your town. The USDA soil survey flags low-strength soils across much of Salem County and a high water table along the shore, and both need more stone than the well-drained sandy loams that cover most of Gloucester County.
Is 2 inches of asphalt enough for a driveway?
Two inches of compacted asphalt can work for a light-use driveway on a strong, well-drained base. For most South Jersey driveways 2.5 to 3 inches gives a longer life for a modest difference in price.
How thick should a sealcoat be?
Sealcoat is a thin protective coating, not a structural layer. Two thin coats beat one thick one, and piling on a coat every year builds a brittle layer that peels.
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