A “mill and overlay” is a street maintenance technique that requires the removal of the top layer (2 inches) of a street by the grinding action of a large milling machine. After the top layer is removed, a new layer of pavement is put in its place.
The entire mill and overlay process typically takes two to three days depending on the width of the roadway and traffic conditions.
Parking is restricted in the immediate area of the work; restriction signs are posted at least 24 hours prior to work starting.
More Information about the Mill and Overlay Process
The “milling” portion of the project typically takes one to two days. After the milling is completed, the “overlay” is placed in one to two days depending on the width of the roadway and traffic conditions.
Before the new pavement is placed, the surface of the newly milled pavement is covered with a liquid asphalt tack coat to bond the old and new pavements. Afterwards, a new asphalt overlay is placed at a depth of 1 ½” using a machine called a paver. Hot asphalt (350 degrees F) is brought in by trucks from the City’s Asphalt Plant
. Each truck carries approximately 10 tons per load and overlay crews can quickly lay 600 to 1000 tons of asphalt per day.