Do you have an existing driveway made of concrete that you are looking to replace? If so, you will want to make sure that it is not damaged. If the concrete is sinking or breaking apart in some places, it can potentially interfere with the new asphalt's performance and appearance. Look for these problems with the existing concrete before you pave over it.
Concrete That Is Sinking
Concrete can be a very versatile and strong material, which is why it is commonly used in driveways. Unfortunately, melting snow and rain can cause the soil under the concrete to become weak over the years. If there was never a proper drainage system placed under or around the driveway, you may have a problem where water settles into your soil. Since soil will not handle the additional water consistently, it can cause areas to sink in certain places.
If you pave over the concrete in this condition, it will cause several problems. This includes potholes, fractures, cracks, and parts that crumble and break apart.
Always have a paving contractor reinforce a driveway in areas that are sinking. It typically involves packing cement underneath the problem areas. A contractor can also install a much needed drainage system that will prevent water from getting into the soil and causing problems. It is the best defense against future sinking.
Concrete That Is Breaking
Another problem to look out for is concrete that has become cracked or broken. This typically happens due to the additional pressure of a car on the driveway, but can also happen due to moisture penetrating the concrete's surface and drying too quickly.
The best thing you can do is repair these broken sections of concrete, which you can even do on your own. You thoroughly clean out any existing cracks, and fill them with a concrete sealant. Once the sealant has dried, you are ready to have asphalt installed on top of it. If you have many cracks, let a professional handle it for you.
In addition, your paving contractor can place a heat-resistant and waterproof coating. This will protect your new asphalt from suffering the same fate as your concrete driveway.
Now that you are aware of the existing damage that can impact a new asphalt driveway, you will not make a costly mistake that will ruin the new paved surface. For more info on damage that should first be repaired, speak with your contractor.