Asphalt overlays

Published on Jun 12, 2022

This technique is a cost-effective measure used in Sturgeon County’s road maintenance program. It can be applied on a variety of roadways, from low-volume subdivision streets to high-volume highways.

What is a thin lift asphalt overlay?

It is an asphalt mixture applied over the existing pavement structure at a thickness of 40 – 60 mm. The mixture is similar to regular hot mix asphalt but may use smaller aggregate pieces to improve compaction. It can be applied using conventional processes and equipment.

A thin lift asphalt overlay is best used when the underlying pavement structure is in good shape. Overlays generally aren’t used if the pavement has full-depth cracks or if the base structure has deep ruts or underlying base problems.

What is a mill and overlay?

A mill & overlay involves the top 40-60 mm of asphalt being ground off, it is then replaced with 40-60 mm of new asphalt.

How long will one last?

It can extend the life of the pavement by eight to nine years and reduces the need for more costly road maintenance.



  • Improve surface smoothness to achieve a better, quieter ride
  • Improve traction
  • Reduce wheel path rutting to improve safety
  • Prevent water damage to the road surface which preserves the pavement structure
  • Maintain or create adequate drainage
No comments found.
Edmonton Web Design