Frost Boil Repair Program

Frost boils happen when moisture reaches the base of a paved road. When temperatures drop below freezing this moisture freezes and expands which results in soil pushing up to the road’s surface, also known as a frost heave. When temperatures warm, the moisture melts which may cause the pavement to collapse.  This annual movement of pavement combined with traffic causes surface degradation to the roadway. To repair frost boils crews remove approximately one meter of roadway material and replace it with a layer of filter fabric/geo-grid combination, pit run gravel, gravel base and asphalt.  The thickness of gravel base and asphalt depend on road classification.