Seal Coating

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Condition
Intermittent linear cracking and/or a worn and ravelled asphalt surface. Aged and oxidized asphalt, rough and rocky with a light gray appearance. Minor alligatored areas (interconnecting cracks) with little or no subsidence of the asphalt surface. These failures are typically wide spread throughout the property but not severe and any locations and often caused by the advanced age and oxidization of the asphalt surface.

Cause
A less than satisfactory base on top of moisture sensitive subgrade causes swell and shrinkage in that subgrade, which reflects through the base material and then up through asphalt until the cracks become visible on the surface. The infiltration of moisture through these cracks and oxidized (dried out) asphalt accelerates the damage.

It is also possible that the existing aggregate base and pavement section is too thin to withstand the type of traffic that it encounters.

Correction
A Petromat Overlay is the application of a liquid asphalt binder and paving of a 1 1/2″- 3″ layer of asphalt over the entire asphalt surface. The addition of “Petromat” paving fabric impregnated with liquid asphalt creates a barrier between the layers of asphalt that retards reflective cracking and water intrusion. This fabric is a nonwoven fabric that helps to dissipate the stresses on your existing asphalt surface and bridge existing weaker areas.

Calvac Paving will excavate or grind the existing asphalt surface at all necessary transitions to allow for full depth asphalt placement in these vital areas. We will then clean the entire surface of the proposed overlay to ensure a complete bond. Apply liquid asphalt binder at a rate of .25-.30 gallons per square yard immediately followed by installation of the “Petromat” pavement reinforcing fabric. The fabric will be installed according to manufacturer’s specifications; which includes an overlap of 3″-6″ at each joint and removal of all necessary wrinkles in the fabric.

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