New Asphalt Installation
The standard asphalt depth for new asphalt is 4″. It is comprised of 2.5″ of type II 448 asphalt and 1.5″ of type I 448 asphalt. It is important to have a proper base to pave over. If the sub-base isn’t correct, then the new asphalt is already compromised and will prematurely fail. Below are some of the general types of removal and installs. To get an idea about prices, you can go on Google Earth and use the measurement tool to get an accurate square footage of your project. You can then compare the square footage to the listed pricing. The pricing listed is just a general idea for customers. It may be higher or lower depending on the circumstances of the project.
Virgin ground that is going to have asphalt should be excavated so that all the topsoil is removed and not present. In Ohio, this is typically 12″. After the topsoil is excavated, a proper sub-base is required. At KCA, we install 6-8″ of 304 granulated slag and then compact the stone with a vibratory roller or tamper. Steel slag or asphalt grindings should never be used to pave over. Steel slag has gases which are still being released and will cause the surface of the asphalt to raise. Asphalt grindings do not compact enough to pave over. Once the sub base is installed, 2.5″ of type II 448 asphalt is installed . This is known as your binder or base coat. Next, 1.5″ of type I 448 asphalt is installed, and this layer is known as the wear layer or top coat.
Existing Asphalt Driveway or Parking Lot Replacement
The process here is to remove the existing asphalt and haul away. Most likely, the base is there and one of KCA’s professionals will check to ensure there is a 6-8′ proper base. If not, then KCA will add slag as needed which is included in pricing specs. One of our main focuses before getting asphalt to pave over the drive is water control. Its crucial to know where the water is flowing. Water is one of the biggest causes for why asphalt fails, so it’s important for the contractor to know drainage issues that may arise. Next, we follow through with paving 2.5″ of binder and then 1.5 ” of wear layer.
Existing Gravel Drive or Parking Lot
In this scenario, one of KCA’s experienced estimators will determine if the base is adequate to pave over. Once approved, the gravel will then be graded and sloped for water control and drainage. All large rocks in the area will be removed. Our team refers to them as “goonies”. These will pop back up in the driveway after paved if they are not removed. Next, the team rolls and compacts the driveway. Lastly, the asphalt binder and top coat are added to make a finished product.
Concrete is very tough to remove and takes much more time and effort to remove compared to asphalt. A jackhammer is usually the tool for this task, and it is used to break up and remove concrete. The issue with concrete is that a lot of contractors do not use stone underneath concrete, so it is mostly made up of dirt/mud underneath the existing concrete. The dirt will be excavated and removed, and 304 slag will then be brought in and compacted at a depth of 6″-8″. After the slag is rolled, the paving process begins with 2.5″ of binder and, lastly, 1.5″ of wear-layer asphalt.