New construction consists of excavation of an area, then adding, grading, and compacting a stone base. After the stone base is ready asphalt mix is installed at the proper thickness designed for your needs. The thickness of stone and asphalt are calculated based upon traffic flow, vehicle weight, and existing soil conditions. With PLM we always pave to the compacted thickness as stated on our contract to make sure your parking lot lasts.
Deterioration of asphalt can happen from a single problem or combination of problems. Poor stone base, poor sub-base (the soils below the stone base), inadequate asphalt thickness, poor maintenance, heavy traffic and Mother Nature can all play a significant role in the failure of your parking lot surface. Once your asphalt has oxidized and deteriorated to a point where an overlay is no longer an option, we will remove and re-pave your lot in accordance with industry standards. Remember your parking lot surface is only as strong as the base beneath it. When we remove and existing parking lot we perform a proof roll to check the base; this involves driving a loaded dump truck on the stone to look for any movement or deflection that would indicate a base problem. We then undercut as necessary prior to paving to assure a longer lasting pavement surface.
Often an asphalt surface is deteriorated but still maintains the structural integrity needed to perform an overlay. This process involves adding a new layer of asphalt, which is applied directly over the old layer of asphalt. A mill can be used in two different methods to help resurfacing. The first method is to mill of a uniform thickness of existing asphalt from the entire parking lot to make room for the new pavement. The second method involves only milling the existing asphalt at transitions, and critical drainage points. No matter which method of milling is used, it is followed by cleaning the entire asphalt surface, then applying tack coat (glue) to help adhesion of the new and old pavements. The new asphalt layer is then installed and compacted.
When asphalt has deteriorated to the point where it no longer qualifies for an overlay we often have two options. The first, as stated above, is removal and replacement. The second option is pulverizing and repaving. There are some limitation to this technique, however if you have a solid base and your match points (buildings, walkways, curbing, concrete pads, roadways etc.) allow for the elevation of your lot to be increased, pulverizing can be an economical and green alternative. A large full depth reclamation machine is used to grind up your asphalt along with a percentage of your base. The area is then watered, graded, rolled and re-paved to a pre-determined thickness to meet your traffic needs. This method uses your existing pavement to increase the thickness of your base, thus giving longer life to your new pavement. The economical value of pulverizing comes from the elimination of excavation and trucking cost. We no longer need to haul the existing pavement off of the site, which in turn will reflect a savings to you as our valued customer.
In many ways driveways require more precision than parking lots. We start by inspecting your driveway to make sure we come up with a custom solution, ensuring that your driveway is installed correctly and will last. With existing driveways the old pavement is hauled away to be recycled and the base is checked to make sure its stable and not going to cause early failure of your new driveway. If the existing base is not suitable it is excavated and a new stone base installed. Grading and compaction of the existing or new base are very important to prevent settling and ensure proper water drainage. Then the driveway is paved and compacted to the recommended thickness. PLM takes extra care on driveway paving to make sure we get a great looking consistent surface, along with tamping the edges to ensure durability.
We also install new construction driveways and additions to existing driveways. In both cases the area is excavated to allow for the proper thickness of stone and asphalt. The stone is installed and graded to ensure the water drainage is correct. Then finally the asphalt is paved to the recommended compacted thickness. Our goal at PLM is always to provide you with the highest quality and a great looking driveway.
At PLM Paving and Concrete we are always looking for quality employees with strong backgrounds in the areas of service that we offer. If you are interested in applying for a job with us to send us your information and we will get back to you shortly.