How to Build a Driveway Apron

The bed needs to be ½ inch deeper than the height of your cobbles (ours were 1⅝ inches tall, so we needed a 2⅛-inch-deep bed). Drive stakes into each corner and at the midpoints along its width. Tie mason's lines between the pairs of stakes so that they run parallel to the centerline of the driveway. The lines should be taut, with one end flush with the surface of the driveway and the other end flush with the street. Measure down from the lines at multiple points to determine how much you need to excavate or add to the bed. If you need to build it up, use aggregate to do so, then compact it.