Fog seal

A fog seal is a light application of a diluted slow-setting asphalt emulsion to the surface of an aged (oxidized) pavement surface. Fog seals are low-cost and are used to restore flexibility to an existing HMA pavement surface. They may be able to temporarily postpone the need for a surface treatment or non-structural overlay.


Preventive maintenance. Fog seals are used to restore or rejuvenate an HMA surface. They may be able to postpone the need for a BST or non-structural overlay for a year or two.



Slow-setting asphalt emulsion.


Mix Design

None beyond the manufacturer’s. A test patch may be needed to determine the proper application rate.


Other Info

Fog seals are suitable for low-volume roads which can be closed to traffic for the 4 to 6 hours it takes for the slow-setting asphalt emulsion to break and set.

An excessive application rate may result in a thin asphalt layer on top of the original HMA pavement. This layer can be very smooth and cause a loss of skid resistance. Sand should be kept in reserve to blot up areas of excess application.


BS group is ready to provide suitable asphalt emulsion and give you advice for having best results in this project.