Base
No matter what type of asphalt you choose, or how thick you put it on the driveway, there must be a solid base under the driveway for it to last. While it’s necessary to follow local building codes, many contractors recommend a compacted base of rock with a depth no less than 8 inches. Compacting the asphalt during installation is important as well, or the surface may give way during hot weather. The ground surrounding the driveway should drain well. The driveway should have a slope of at least 1/4 inch per foot.
