Seal coating consists of applying an asphalt emulsion to an existing bituminous surface and then applying an aggregate material on top of the emulsion. Seal coating helps rejuvenate pavements that have become hard and brittle along with helping provide a waterproof layer.
Seal coating is done in a multi-step process. The Street Department prepares the streets to be seal coated by doing minor hole patching, street repair and thoroughly sweeping and cleaning the surface. An asphalt emulsified oil is sprayed on the surface of the existing pavement. A cover aggregate is then quickly applied as to soak into the oil. The cover aggregate is compacted into the asphalt emulsion using rollers. A final sweeping of the aggregate is done after a minimum of 72 hours.
During the patching and prep work, streets, or portions of streets, may be temporarily closed. Throughout the seal coating process, traffic is restricted until the aggregate is applied and parking is prohibited on the streets being coated. Any parked cars left on the street will be towed to driveways or around the block in the event that they are not moved. In most cases, the streets due for seal coating will be marked off. Streets will be available for parking after the aggregate is applied and the necessary compaction is complete.