What Is Tack Coat?

A tack coat, when sprayed onto pavement, functions as a glue to hold existing and new pavement layers so they function as a single, unified pavement for improved strength and durability. When propely bonded, the resulting pavement structure uniformly distributes traffic load stress. Without proper bonding, each pavement layer works independently, failing to distribute stress evenly, leading to cracking, rutting, slippage and other distresses that destroy road quality.

In the same way that fragile, thin veneers of wood are glued to each other to form a robust sheet of plywood, research shows layers of asphalt pavement perform better when bonded to each other.