Asphalt Resurfacing & Overlays
When asphalt roadways and parking lots develop extreme surface failures such as widespread interconnected cracking resembling alligator skin, it is probably time for asphalt resurfacing, also known as asphalt overlay. The problem is that once cracks start appearing and they are not cared for, water settles into those cracks. As cracks get larger and deeper, eventually, even an overlay won't be an option. At that point, you will have to spring for a whole new parking lot.
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As opposed to mix and mill, which recycles the asphalt surface and the base layer, asphalt overlay is the placement of hot mix asphalt over existing asphalt. This pavement resurfacing technique is typically applied using an asphalt emulsion tack coat which assures proper bonding of the old asphalt layer to the new one. Overlays are recommended when the asphalt surface is weak and requires strengthening by introducing a new layer of asphalt. As soon as the freshly laid hot asphalt mix is compacted and begins to cool, the curing process begins and the new pavement becomes firm.
Subsequent to asphalt resurfacing and curing, it is recommended that the new surface be sealcoated. Sealcoating limits the overlay’s exposure to the elements and protects the area from gas and oil drippings, sun, salt, and water penetration. Driveway Maintenance recommends sealing the area 9 to 12 months after the asphalt has cured and every 24-36 months thereafter.
