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While some areas may allow for a slope of up to 20%, this is often the maximum slope for driveways, with a few exceptions of up to 25%. Other regions may have a maximum of 12%, 15%, or 18%, so check with your local building department to ensure you’re laying a driveway that is up to code for your location.

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.

You can pour concrete over asphalt if it’s in good condition, thick, stable, and well-compacted. Concrete is more durable than asphalt and can extend the lifetime of your driveway without having to pay frequent asphalt driveway repair costs or replace it completely. 

But this is best reserved as a temporary solution based on budget restraints, as asphalt requires more frequent repairs and assessments than concrete. Once that concrete top is poured, it’ll be harder to accurately understand what’s happening beneath that layer, which could lead to more issues.

Paving is a part of hardscaping, so all paving is hardscaping, but not all hardscaping is paving. Paving involves laying down concrete or asphalt, while hardscaping can also include the use of paving stones, bricks, gravel, wood, and more. Hardscape features that involve paving are considered permanent and will increase your property taxes, while some other hardscaping features—like those involving bricks, gravel, and paving stones—will not affect property taxes. Paving also typically requires a permit, while hardscaping features considered temporary will not.