If cracks in asphalt pavements are not sealed, surface water penetration can reduce the strength of base and sub-base layer which can result in increased deterioration of the asphalt surface resulting in the development of more cracks, depressions and potholes. Crack sealing can extend pavement life of 2 to 5 years. This can be achieved with effective crack sealing and can be a cost effective manner by slowing the rate of asphalt deterioration.

Conditions:

The question arises regarding how long to wait for cracks to develop and widen prior to sealing. Engineers suggest that crack sealing be considered early in the pavement life. When cracks appear they should be routered to a width of 3\4” inch and depth of 3/4” inch for a proper penetration into asphalt surface.

• Cracks to be router or cleaned by brushing and air power blowers to provide proper bonding surface, free of dirt and moisture.
• Sealant must be melted in a jacketed double boiler type melting unit with effective agitation system, and heated at the recommended pour temperature for that material.
• Application is with pressure feed wand system or gravity feed pour pot. This will place 1” inch band down the center of the crack to protect weak asphalt edge.

Crack sealing in winter conditions is not recommended because of the possibility of trapping moisture beneath the asphalt surface.