Generally, the asphalt pavement surface of a residential or commercial property, parking lot or street has a usable life of seventeen to twenty years, all dependent upon usage and maintenance. An asphalt overlay is a new layer of asphalt applied to a structurally sound (repaired as necessary) but worn and deteriorating surface. This application re-sets the pavement life. An overlay also levels depressions developed over time across the surface of the existing pavement. Edge milling should be performed in conjunction with an overlay whenever the pavement is bordered by concrete. This allows for a smooth transition between the concrete and the new layer of asphalt.