Blacktop Driveways Over Concrete Ask the Builder
Blacktop Driveways Over Concrete Checklist. Blacktop over concrete is not a good idea; ... The asphalt cement that bonds the pieces of sand and gravel in the blacktop can and does move over time. ... Remove the broken part. Drill 1/2inch holes into center of remaining slab 16 inches on center. Drill them 5 inches deep.