Sealcoating / Fog Sealing Road Surfaces
Seal coating and fog sealing is a street maintenance technique which preserves the condition of a street by sealing the surface and small cracks within the existing asphalt pavement. This type of preventative maintenance on a timely basis can significantly improve the life of the street. The City seals streets on an annual basis with several other communities in Dakota County (see link below for the proposed streets to be sealed this year).
Sealing the streets involves either applying a very thin layer of hot liquid asphalt to the street surface (fog sealing) or applying a hot liquid asphalt combined with a graded aggregate (seal coating) to produce a protective water resistant coating. There are several steps to seal coating
- First, the street surface is swept clean of all loose pavement and dust.
- Next, the surface of the asphalt is completely covered with a layer of liquid asphalt using a tank truck called a distributor.
- Afterwards, a layer of gravel is placed over the liquid asphalt with a machine called a chip spreader.
- Crushed granite gravel chips are then worked into the asphalt with a rubber tire roller.
- Traffic is allowed back on the street within several minutes of placing and compacting the gravel, as the weight of vehicles helps to work the gravel into the soft asphalt.
- Finally, the streets are swept to pick up any loose gravel.
Sealcoating is weather dependent and the streets need to be clean and dry. Construction work is allowed to take place between 7 a.m. to 9 p.m. Monday through Saturday. “No Parking” signs will be placed in advance of the work.