Click on the map above for a full-size pdf version, which shows how slurry sealed street smooth out over time.
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2016 Street Overlay Map
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Map of Slurry Seal History
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Educational Video: Street Preservation "Lifecycle of a Street"
Slurry Seal Brochure
Pavement Management System
Street Preservation Techniques
George Minassian, P.E.
Neighborhood Outreach Coordinator
(425) 587-3831 Update (Sept. 9) -- Kirkland extended the optimal life of more than 40 road-sections in late August when its contractor applied slurry seal to their surfaces.
This quarter-inch layer of water, aggregate and emulsified asphalt (oil) shields the pavement beneath it from weather and replenishes that pavement with new aggregate. These functions can extend roads’ good conditions for five to 10 years. And all it costs is $1,600 per city block, compared to the $17,000 per city block it costs to repave a road or the $65,000 per block it costs to rebuild a road.
The cost-effectiveness of slurry seal is why thousands of municipalities throughout the nation use it and why the City of Kirkland has used it in every neighborhood throughout the City for the last 14 years.
These benefits, however, can be hard to see in the first few weeks after the streets first receive slurry seal. Initially, the surface is gritty, where it was once smooth. This initial grit is normal. But it is not permanent.
The first phase of your street’s transition toward smoothness is the street sweeping, which removes all of the loose gravel. This occurs approximately one week, three weeks and three months after application. The second phase of that transition is more subtle. And its main ingredient is time.
Over time, automobile traffic will dislodge the larger, sharper pieces of aggregate that initially give the road its rough, gritty surface. Traffic will also push the remaining aggregate deeper into the surface.
Within a year or so, the smooth road residents remember before slurry seal will be back—with an extra five to 10 years of high-quality life infused into it.
This will be the 14th straight year Kirkland uses the mixture of emulsified asphalt and sand to maximize the lives of its neighborhood roads.
And for good reason. Sealing a road costs approximately $1,600 per city block to apply, compared to the $17,000 it costs to grind and repave a city block.
But the street sealer functions differently than new pavement does. Its purpose is to keep good roads in good condition. It achieves this by sealing the pavement from weather and by replenishing the aggregate in the pavement with the aggregate in the slurry seal.
To apply it, crews must close down the street and residents must stay off it—no cars, no shoes, no water—until the slurry seal has cured. For this reason, Kirkland uses it exclusively on its neighborhood roads—roads that few drivers travel.
In warm and dry weather, slurry seal can cure in four hours. In more humid weather, curing might last as long as six hours.
2012 Streets Levy
The 2012 Streets Levy is doubling the number of lane miles the City of Kirkland can slurry seal each year. Kirkland has a goal of treating every residential street in the City with slurry seal by the year 2032.
October to February: Street selection and design
November to January: Surveying and data collection
March to June: Prepping, grinding, repaving and striping Lake Washington Boulevard
May to July: A.D.A. upgrades to curb ramps
July to September: Repaving arterials
July to September: Treating neighborhood roads with slurry seal