Thin-Lift Asphalt Overlays
Thin-lift asphalt overlay 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?
Thin-Lift asphalt overlay is an asphalt mixture applied overtop of the existing pavement structure at a thickness of 1.5 - 2 inches. 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 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.
How long will a thin-lift overlay last?
It can extend the life of the pavement by eight to nine years and reduces the need for more costly road maintenance.
Benefits of thin-lift overlay:
Improve surface smoothness to achieve a better, quieter ride
Reduce wheel path rutting to improve safety
Prevent water damage to the road surface which preserves the pavement structure.
Maintain or create adequate drainage