![]() ![]() If the grade is flat and drainage is slow, this may mean that a thicker amount should be placed at the beginning of the downward slope. Second, the existing asphalt’s drainage is a major factor. A very thick overlay is usually referred to as a structural overlay The more damage to an existing asphalt surface, the thicker the overlay should be. The thickness of an asphalt overlay depends on a couple variables.įirst, the existing asphalt’s condition plays a big role. Thickness of this layer may vary because of the inconsistencies of the existing surface.įinally, the surface layer of asphalt is applied. This layer helps re-grade areas of the existing asphalt that may have drainage issues. Next, a street sweeper prepares the surface and a tack coat adhesive is applied.Īfter the area is prepared, the first layer of asphalt, known as the “leveling course” is applied. Areas that cannot be accessed by the mill will be removed.Īfter that, most asphalt overlays require removal and replacement of the very poor areas in a process known as base patching. The mill most always shaves the existing asphalt down to the thickness that the overlaid surface receives. A machine known as an asphaltic mill will “shave” the top of an asphalt surface down to enable the new asphalt to match existing asphalt, curb and gutter, sidewalks, or concrete pads. This depends on the project, but usually the first process involves milling. Very simply, an asphalt overlay is a method in which an existing asphalt surface is paved over with a new asphalt cross section. Like a beacon in the dark night of parking lot/road construction, an asphalt overlay is providing hope and a newly paved asphalt surface. Somewhere, an asphalt overlay is saving the day. 5 Things to Know About An Asphalt Overlay ![]()
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