Asphalt driveways across the Valley

An honest note on materials

Across much of the Phoenix metro, residential driveways are more commonly concrete or pavers than asphalt, and a homeowner comparing options deserves that context rather than a sales pitch.

Asphalt has real advantages: it is generally less expensive to install, it goes down faster, it is easier and cheaper to repair in sections, and it tolerates minor ground movement better than a rigid slab because it flexes rather than cracks.

It also has real disadvantages in this climate: ultraviolet exposure ages it faster than it would elsewhere, summer heat softens the surface, and it wants periodic maintenance to stay in good condition.

Where asphalt makes the most sense is on long drives where the cost difference is meaningful, on rural or semi-rural properties, where ground movement is a factor, and where an existing asphalt drive is already in place and worth maintaining rather than replacing with something else.

How a Valley driveway ages

The sequence is predictable and it is worth recognizing early, because the cheap interventions are all at the beginning of it.

First the surface grays as ultraviolet exposure oxidizes the binder. Then fine cracking appears, usually at the edges and anywhere the drive meets concrete. Then water gets into those cracks and into the base beneath.

In summer, the surface softens enough that vehicle tires — particularly turning in place, or a vehicle parked in the same spot for long periods — leave marks and depressions. Jack stands and trailer tongues do the same thing faster.

Once water has been in the base through a monsoon season or two, the failure becomes structural: alligator cracking in wheel paths, then material breaking out, then a pothole.

The intervention that costs least and helps most is sealing cracks early, before water has had a chance to work on the base.

Edges are the weak point

Driveway edges have no lateral support, which makes them the first thing to crack and crumble on most residential drives.

Vehicles running off the edge, irrigation keeping the ground beside it soft, and vegetation growing at the margin all accelerate it. Once the edge breaks down, water has a route into the base along the whole length.

Keeping the shoulder firm, keeping irrigation off the edge, and dealing with edge cracking early are unglamorous and they meaningfully extend the life of a drive.

Repair, resurface or replace

The same logic that governs a parking lot governs a driveway, at a smaller scale.

Isolated cracks and surface wear on a sound drive are maintenance: seal the cracks, consider a surface treatment, keep the edges intact.

Alligator cracking in the wheel path is base failure, and it needs the failed area removed and rebuilt rather than filled. Where it is confined to a section, that section can be repaired.

Where the base has failed broadly, or the drive has been patched repeatedly, or the grade no longer drains away from the house, replacement is usually the cheaper answer over any reasonable horizon.

Resurfacing sits in between and comes with the same caveat as on a commercial lot: it renews the surface and does nothing for the base, and cracks in the old surface tend to reflect through the new one.

Drainage, and the one that matters at a house

On a commercial lot, poor drainage costs money. On a residential drive it can cost considerably more than the drive, because the water has somewhere to go and that somewhere is frequently the garage or the house.

A drive should move water away from the structure, positively, with no flat spots or low points that hold it. Where a drive slopes toward a garage, that is a problem to solve rather than a feature to live with, and it is worth raising before any resurfacing that would lock the grade in.

Monsoon rain is the test. A drive that handles ordinary weather can reveal itself in one afternoon, and what it reveals is where the water actually goes.

Practical maintenance

• Seal cracks early, before water has been into the base.
• Keep the edges supported and irrigation off them.
• Avoid parking heavy vehicles or trailers in the same spot through the hottest months, and use a pad under jack stands and tongue jacks.
• Clean oil and fuel drips, which soften the binder locally.
• Watch where water sits after rain — that is where the next problem starts.
• Do not sealcoat a drive that needs structural repair; it is the same mistake as on a commercial lot, with a smaller invoice.

Asphalt driveways across the Valley — common questions

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