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While blacktop is a type of asphalt, the terms should not be used interchangeably, as not all asphalt qualifies as blacktop. The primary differences are in their composition, production process, and ideal applications. Blacktop contains more stone than other types of asphalt and is heated to a higher temperature during production—300°F or more—while hot-mix asphalt is heated to between 275°F and 300°F. The ratio of bitumen (a tar-like crude oil) is a key differentiator, though sources vary: some state blacktop has less bitumen, making it less durable, while others claim it has a higher ratio. Due to these differences, asphalt is generally more durable and better for high-traffic areas like highways and streets, while blacktop is more suitable for playgrounds and residential driveways. For a driveway project, it is best to consult a professional to determine the most appropriate material.

Driveways should be sloped with a minimum 2% slope—anything lower will cause precipitation and runoff to collect. A 2% slope is the equivalent of a 2-foot rise over 100 feet. One quick way to check the integrity of your driveway’s slope: no more than four inches of water should collect on the surface longer than 15 minutes after rain.

Driveway aprons typically range between four and seven inches thick, though your town's building codes will likely have specific requirements. Additionally, you may need to add a layer of permeable aggregate in the excavation below your paved apron to ensure proper stormwater drainage.

An ideal driveway gradient is between 2% and 5%. Anything lower than 1% or higher than 15% can cause problems for your car or property. A driveway with less than a 1% slope increases your likelihood of flooding and water damage, while a driveway with a 15% grade or higher can be too steep for safe traveling.