Asphalt overlay means asphalt paving over existing asphalt pavement. It is usually done after thorough inspection of your existing asphalt pavement for any cracks, defects or problem areas. If the state of your pavement is satisfactory, the top layer is removed for better grip and a new asphalt is layed on top. If the state of your existing asphalt is excellent but needs renewal, asphalt sealing may be the best solution.