RESURFACING OR REPLACING YOUR ASPHALT DRIVEWAY
Many people install a new asphalt drive over an existing driveway of some type. This is commonly called “resurfacing” – and is different from “sealing” the drive. Resurfacing is not usually as long-lasting as removing the old drive and installing new asphalt; however, since total replacement costs about a third more than resurfacing, many people will explore the resurfacing option for financial reasons. As in any repair, the amount of time and effort spent in preparation will determine how well the finished driveway looks and how long it will last. In exploring your options for an asphalt drive, the following things should be considered:
The best method is to install the asphalt by itself and not over an old drive. In a complete tear-out, the contractor completely removes the old drive, and lays down a 4” layer of compacted gravel for drainage (note: all code requirements are based on Building Code in Cleveland Heights). This is followed by a course of compacted asphalt as a base (a #301 binder course, 2” thick, is the minimum required by code, but 4” is better). Finally, a surface
layer of 2”-thick compacted asphalt (#404 surface course) is installed. This type of installation will provide the longest lasting job. If you are considering total replacement, you might also price concrete, and compare the costs – and the advantages and disadvantages – of each.
Asphalt Resurface (over Asphalt):
A #404 surface course of asphalt can be installed on top of existing asphalt. Since the product used for both layers is the same, the layers should heave together in the winter. However, before choosing this option, you should consider why your present drive is failing. For example, is the base underneath the asphalt not giving it the proper support? Putting new asphalt on top of existing problems won't make them go away. The time to correct them is before you install the new asphalt.
Asphalt over Concrete:
Asphalt can be installed on top of concrete; however, you will be taking a risk that the concrete underneath will, after a period of years, heave and move under the asphalt, cracking or breaking the surface. Nevertheless, it is possible that your drive may last for a long time without this happening.
There are some things to look at in your existing concrete that can help you decide whether or not to try installing asphalt over concrete. Are the driveway blocks level? Are the joints or cracks pretty close, or are there large gaps between the pieces? Is one side raised up where it shouldn't be? Evaluate these problem areas of the driveway. The more prominent they are, the more likely you are to have problems later on.