Preservation Surface Treatment Projects
What is Pavement Preservation?
There are a variety of preservation (preventive) treatments used to extend the life of streets at a much lower cost than a standard asphalt overlay. The type selected for a particular street depends upon several factors, such as current surface condition, carrying capacity and travel use Pavement Management’s preservation (preventive street treatment) projects alternate each year between the east and west sides of Vancouver. The focus for 2024 is on neighborhood areas east of Interstate 205.
2024 Preservation Treatments
For 2024, For 2024, almost 74 miles of streets in east Vancouver will see some type of preservation used to protect and extend the life of the street. Those street segments include these major corridors: SE Mill Plain Blvd., SE 164th Ave., SE 34th Street, Cascade Park Drive and SE 192nd Ave. Several neighborhood streets within the North Image, Burnt Bridge Creek, Fisher’s Landing East and Fisher’s Creek neighborhoods will receive slurry seal preservation treatments. Advance tree trimming, curb ramp upgrades and crack sealing/repairs occurred where needed. Actual pavement work typically takes place between July and September.
Pavement Map: Streets and schedules are still being finalized for this year’s program. Watch this page for the 2024 Pavement Management Program map to be posted soon.
Reference Guide: View a handy reference guide with tips for upcoming pavement work. This guide has information about parking restrictions, watering restrictions and potential weather-related delays, along with general dos, don’ts and other tips.
Curb Ramp Improvements Prior to Surface Treatments
As a precursor to the surface treatment work, crews often install new intersection curb ramps or retrofit existing curb ramps at various, identified intersection locations to meet compliance requirements of the Americans with Disabilities Act. Streets receiving treatments that are considered an alteration – such as asphalt overlay paving, microsurfacing and cape sealing treatments – are required to be upgraded so that existing curb ramps meet current ADA requirements. See tab above for more information.
What to Expect Prior to Street Work?
In most cases, residences and businesses fronting impacted streets receive door hanger notices in advance of pavement street work. Within construction zones, drivers are asked to be prepared for delays, watch for traffic changes, proceed slowly, and be alert to construction workers, bicyclists, pedestrians and other motorists. Regardless of the type, all pavement applications are highly weather dependent.
Construction hours are typically from 7 a.m. to 5 p.m., Monday through Saturday, though work may continue as late as 8 p.m. if needed. All paving applications are highly weather dependent. In case of rain, work must be postponed and rescheduled.
Types of Pavement Preservation:
Microsurfacing begins as a coarse liquid application of dense-grade aggregate, asphalt emulsion, water and mineral fillers. The quick-setting emulsion allows traffic to begin using the new surface in a short time, as little as an hour depending upon conditions. As the product cures, the surface becomes smoother. The finished sealant forms a thin shell over the street’s existing asphalt surface, extending the life of the underlying pavement. Microsurfacing applications are generally applied on arterial and higher volume streets.
Slurry Seal is a mixture of fine rock, asphalt, and water placed on the pavement about ¼-inch thick to protect the surface from sun and rain. Slurry seal applications are generally applied on lower volume local and residential streets.
Chip Seal is a layer of sprayed emulsified asphalt and then a layer of new rock. A chip seal treatment typically extends the life of a road by seven to 10 years and provides a new sealed surface at a fraction of the cost of a standard asphalt overlay.
Cape Seal is a surface treatment that begins with a chip seal and then combines a final slurry seal, or even a microsurface, application. This treatment can greatly extend the life of the roadway.
Chip and Fog Seal treatment begins with a chip seal and then is finished up with a fog seal. Chip seal methods can include an asphalt rubberized chip seal or a ¼-inch chip seal, both helping increase durability, decrease loose chips and improve smoothness of the street. The type of chip seal method used depends on the amount of current traffic on the roadway.
Asphalt Rubber Chip Seal is a treatment that involves an asphalt rubber binder being applied to the street, then topped with a layer of chipped rock. Crews then apply a fog seal – a thin layer of liquid asphalt that coats and preserves the pavement to extend its life – to the surface.
Bonded Wearing Course is an open-graded, thin hot-mix asphalt mixture applied over a thick polymer asphalt emulsion membrane. The high binder content seals the underlying road, protecting it from water infiltration and slowing the aging process. Bonded wearing courses have been used throughout the country and were used in Vancouver for the first time in 2018.
Construction questions during summer street work:
Public Works Construction Services: 360-487-7750
7:30 a.m. to 4:30 p.m., Monday through Friday
Pavement Reference Guide