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An asphalt driveway should be at least 3 inches thick over a compacted gravel base. Areas with poor drainage should have a thicker stone base. To install a new asphalt driveway over an existing driveway, the new asphalt should be at least 2 inches thick and the existing driveway should be in relatively good condition.

Building a road on a slope requires careful planning and will normally require a drainage system underneath to prevent flooding and damage to the road over time. Your professional may lengthen your road to create switchbacks if the slope directly to your home is too steep, as there are regulations for maximum road slope. The drainage system will help prevent runoff from the higher side of the slope from damaging the asphalt or concrete. Keep in mind that building a road on a slope isn’t a good DIY project, as a lot can go wrong.

Common alternatives to a gravel driveway include concrete, asphalt, brick, stone pavers, and permeable pavers. Concrete and asphalt are generally the most affordable options. However, concrete can be prone to cracking in cold climates, while asphalt may soften in areas with high heat and direct sun exposure. For enhanced curb appeal, brick, stone, and permeable pavers are popular choices, though their installation can be more expensive due to intricate designs. Stone pavers offer a natural look and are sometimes installed with gravel around them. Both permeable pavers and brick driveways provide excellent drainage, which helps prevent flooding and reduce water runoff.

Like all driveway materials, asphalt can crack in the wrong conditions and with age. Many things can cause asphalt to crack, including shifting soil or settling under the foundation. Other common causes are driving oversized vehicles on the asphalt, tree roots, and using rock salt during the snowy season. Proper installation and sealing the driveway every 10 years can help prevent cracks.