how thick should the packed pavement be on the driveway?
As an option, some contractors use 6 to 8 inches of compacted aggregate, or gravel, as a base for 3 inches of asphalt pavement. We recommend full-depth asphalt for driveways, says Kent Hansen, NAPA Director of Engineering. We calculate that asphalt can replace aggregate on a ratio of 1:3 in thickness.