What is an Asphalt Pavement Overlay?
An Asphalt Pavement Overlay is the paving of new asphalt on top of existing asphalt. Depending on the depth of new asphalt, one or more layers of new asphalt may be applied to give your parking lot or roadway a fresh, clean look.
Why is an Asphalt Pavement Overlay Important?
Asphalt Pavement Overlays are important because they increase the structural integrity of existing asphalt surfaces by adding a new layer of asphalt to the parking lot or roadway. Over time, it is normal for an asphalt surface to wear down due to use. An overlay will bring the asphalt pavement back to it’s initial new look.
How are Asphalt Pavement Overlays Performed?
This process consists of several steps including preparing and cleaning the area prior to performing work leveling asphalt of low areas, grinding of all transitions, adjusting of all drainage structures, and many other steps unique to each site.
Once the site is properly prepped, a layer of DOT approved tack coat is applied to the surface which ensures asphalt adhesion. After the tack coat is applied, hot mix asphalt is loaded into the paver and laid down by the crew in an even layer thicker than the desired depth. The asphalt is then compacted with a vibratory roller to the proper thickness, and finished with a rubber tire roller which creates a smooth and even surface. There are also additional options which can be added to an overlay project such as:
Geotextile Reinforced Resurfacing – An option that may be included with asphalt resurfacing is Petromat. Petromat is a non-woven, petroleum-based geotextile fabric used to retard reflective cracking between the existing pavement and the newly installed asphalt surface. This fabric acts as a waterproofing membrane, while also adding structural support and strength.
Leveling Binder – In low areas, hot asphalt is installed at various depths to adjust pitch to proper grades while increasing parking lot strength.
Butt Joint/Grinding – In areas requiring the resurface to tie into other existing surfaces (i.e., concrete, etc.) asphalt is removed along the perimeter to allow proper depth of asphalt on the edge.
Transitional Milling – In areas requiring the resurface to tie into other existing surfaces (i.e., concrete, etc.), asphalt will be milled and replaced to allow proper depth and transitions. An asphalt milling machine is used to remove an appropriate depth of pavement in a grinding process. The millings can then be hauled off and recycled.