A bituminous surface treatment (BST) pavement, also known as tar & chip or chip seal, is a cost-effective method to maintain and extend the life of roads carrying low volumes of traffic. BST combines one or more layers of emulsified asphalt and fine aggregate together to provide a hard driving surface. The process may include pulverizing the existing hard surface on the road, adding gravel and then proceeding with the surface treatment process. This process consists of spraying a layer of liquid asphalt onto the road, followed by a layer of crushed stone. The materials are rolled and compacted to create a sealed, weather-resistant surface. As traffic moves over the road, the loose stone settles in further.
This process is often referred to as “single surface treatment" when applied once, or “double surface treatment" when applied twice for added durability.
How will surface treatment improve the road?
- Increases Skid Resistance: Enhances traction, improving safety, especially in wet conditions
- Prevents Moisture Intrusion: Protects underlying materials from water infiltration, reducing potential damage
- Provides Anti-Glare Surface: Reduces glare during wet weather, improving visibility for drivers
What are the benefits of surface treatment?
- Cost-Effective: More affordable compared to other road maintenance methods.
- Time-Efficient: Requires less time to apply than alternative construction techniques
- Extends Road Lifespan: Helps to prolong the life of the road, reducing the need for frequent repairs
Frequently Asked Questions
What does it look like?
A newly applied surface treatment pavement will have some loose stone on the surface, which may resemble a gravel road. These stones are further compacted and pressed into the asphalt emulsion due to traffic volumes and outside temperature, this may take weeks or months after the application depending on the severity of these factors. The road will eventually resemble the hard pavement of asphalt roads. Please drive carefully during and following construction as vehicles can damage the fresh surface and traction is limited directly following construction as the stones are still loose.
How do I access my property during construction?
During normal construction hours, Monday to Friday, 7:00 am to 7:00 pm, vehicle access to and from your property may be difficult. Driveways will be temporarily closed when work is being carried out in the immediate area. You will be notified in advance, by the Contractor.
Is there dust mitigation?
During construction, there will be increased levels of dust and loose gravel throughout the project limits. Water is applied during construction as a dust suppressant by the contractor
Will my garbage pickup be affected?
Please continue to put your garbage and recycling out on the usual day. It is the contractor's responsibility to move your garbage to a location that can be easily picked up by the garbage truck and return your garbage containers. To help the contractor return your bins to you, we ask that you write your house number on your garbage cans, recycling bins and green carts.
Will there be road closures and lane restrictions?
Heavy machinery will be operating within the roadway during the construction process. Lane restrictions will be in place during construction. You will still have access to your home. Expect delays while driving through the construction zone.
What is the loose aggregate that remains on the road and how long does it last
The loose aggregate on the road is referred to as float and typically will clear off the road two weeks after construction. The higher the volume of traffic travelling on the road, the quicker the float will clear off. In situations where excess float occurs, the contractor may return to remove the float from the roadway.
