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Chip Seal and Slurry Seal
Road Maintenance
The City of Twin Falls applies both chip seal and slurry seal each year during the summer months to extend the life of asphalt roads and minimize long-term costs. The City follows a work schedule that consolidates maintenance projects, minimizing the impact on residents and commuters.

Chip Seal
Chip seal is applied by spraying a heavy coating of emulsified asphalt oil onto a road surface and then covering the oil with rock. Rollers are then utilized to embed the rock into the oil, forming a new wearing course.

A chip seal is applied when the pavement deterioration is greater than what a slurry seal is designed to correct, yet has not deteriorated to the point of requiring an expensive asphalt overlay. A chip seal helps prevent water penetration, reducing subsequent damage to the road bed, along with providing a new wearing course. Used with crack sealing and surface patching, a chip seal significantly extends the life of a neighborhood street.

Slurry Seal

Slurry seal is made from emulsified asphalt, which is a mixture made from oil and fine sand aggregate. It is typically applied to a street once every seven to eight years. Before slurry seal is applied, minor repairs such as pot hole patching and crack sealing are performed to extend the life of the pavement.

On the day of the actual slurry sealing, the street is closed to traffic. Debris and loose material are swept up and then the slurry seal coat is applied to the street. It takes approximately 2-4 hours for the slurry to cure. Once the slurry has cured, only then will the road be open to traffic. Weather conditions may impact the slurry and cause delays in the street opening.
  • There are no slurry seal projects expected in 2014.

Fog Seal

Important Notice to Motorists
Please heed the road closures and detours that have been put in place to keep drivers off uncured slurry sealed streets.