Two asphalt driveways can look identical on the day they are finished and perform completely differently a few years later. One stays smooth and solid. The other starts sinking at the garage, cracking along the wheel paths and holding puddles by the second winter. The difference is almost never the black surface you see. It is the decisions made before and during paving.
If you are planning a new driveway, these are the four factors that matter most, and the questions worth asking any contractor about them.
Factor 1: What is underneath (base and subgrade)
The asphalt surface is the top layer of a system. Under it sits a compacted aggregate base, and under that is the native soil, called the subgrade. The asphalt spreads the weight of a car over the base, and the base spreads it over the soil. If either layer below is weak, the asphalt will eventually show it.
Soil conditions vary a lot across our area. Many parts of Monmouth and southern Middlesex County have soils with enough clay to hold water and stay soft. Closer to the shore and in parts of Ocean County, soils are sandier and drain well, but loose sand still needs to be properly compacted to stay put. Old driveways sometimes sit on topsoil, organic material or a thin, mixed layer of fill that was never meant to support a pavement.
Good preparation means excavating unsuitable material, correcting soft spots, installing a base of quality aggregate such as quarry process to an appropriate depth, and compacting it thoroughly with a roller. Skipping or skimping on this step is the most common reason driveways fail early.
Factor 2: Drainage and grading
Water causes more asphalt damage than anything else, so a driveway has to be built to get rid of it. That starts with grading. The base and finished surface need enough pitch for water to run off, either toward the street, to the sides, or to a drainage point, and always away from the house and garage.
The surroundings matter as much as the surface. If the lawn beside the driveway is higher than the asphalt, water will sit along the edge and soak into the base. If downspouts empty onto the driveway, the surface gets a constant flow of roof water. A careful contractor will look at all of this before paving and point out anything that needs to change.
Factor 3: Asphalt thickness and compaction
The thickness of the asphalt layer, and how well it is compacted, directly affects strength. A layer that is too thin can crack under normal loads, particularly where heavier vehicles like delivery trucks turn. Thickness also needs to be consistent across the driveway, not thick in the middle and thin at the edges.
Compaction is just as important. Hot asphalt has to be rolled while it is still at the right temperature, so it becomes dense and tight. Under-compacted asphalt has more air voids, which let water in and lead to raveling and early cracking. Edges need extra attention, since they are the hardest part to compact and the first to break down.
When you compare estimates, ask what compacted thickness is being quoted for the asphalt and for the base. Those numbers tell you more than the price alone.
Factor 4: Weather and timing
Asphalt is placed hot, and it needs to stay workable long enough to be spread and rolled properly. Cold air and cold ground pull heat out of the mix quickly, which can lead to poor compaction. Rain is a problem too, both on the day of paving and if it has left the base saturated.
In New Jersey, the paving season generally runs from spring into fall. Late spring and early fall often offer ideal conditions. Summer works well too, though very hot weather means the new surface takes longer to firm up before you can drive on it. Late-season paving is possible on mild days, but it requires closer attention to temperature.
Putting it all together
When every one of these factors is handled correctly, you get a driveway that drains well, carries its loads and lasts. That is the standard we hold ourselves to on every asphalt driveway paving project.
To see how these pieces fit into the actual work, read our practical guide to installing an asphalt driveway. And before the crew arrives, check out what you should do before installing a new driveway.
Need this done right?
Dan The Paver handles asphalt driveway paving across Monmouth, Ocean (Toms River and north) and southern Middlesex counties. Free on-site estimates.