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WEBINAR: Beating the Heat: ASU’s Cool Pavement Study, Year 2 Results

This session featured insights from Ryan Stevens and Dr. Jennifer Vanos, who shared groundbreaking findings from Arizona State University’s (ASU) ongoing Cool Pavement Study for the City of Phoenix.

On February 12, CoolSeal’s Maria Koetter hosted "Beating the Heat: ASU’s Cool Pavement Study, Year 2 Results" as part of the Cool Communities, Healthy People Webinar Series. This session featured Ryan Stevens and Dr. Jennifer Vanos, who shared the latest findings from ASU’s Cool Pavement Study and their implications for the future of urban development in Phoenix, Arizona.

In 2022, the City of Phoenix and ASU researchers continued their Cool Pavement Pilot Program, testing CoolSeal 2.0 in "Phoenix Gray", a heat-reflective coating by GuardTop®. Building on 2020 findings, this phase confirmed that CoolSeal lowers street and air temperatures but may increase midday heat reflection, making it feel warmer for pedestrians. The study also found that CoolSeal reflects less UV radiation, potentially reducing exposure.

Key Findings from the Study:

  • Cooler Streets: CoolSeal 2.0 lowers surface temperatures by up to 12°F at noon, keeping roads cooler than regular asphalt.
  • Cooler Air: Air above CoolSeal was a bit cooler overall, especially after sunset.
  • Less UV Exposure: The coating reflects less UV radiation than traditional asphalt, reducing potential exposure.
  • Long-Term Benefits: It keeps pavement cooler below the surface, which could help roads last longer.
  • Best Uses: Ideal for residential streets and parking lots, but not recommended for high-foot-traffic areas like playgrounds.
  • Moving forward, Phoenix is tackling rising temperatures with a mix of cool pavement, shade, and heat resilience efforts like the following:
  • Cool Pavement Expansion: Continuing to apply CoolSeal 2.0 to lower road temperatures and help combat heat buildup.
  • Cool Corridors Program: Investing $1.4 million annually to add shade structures, trees, and shaded bus stops, making streets more walkable and reducing heat stress.
  • Heat-Resilient Infrastructure: Upgrading roofs, roads, and public spaces with heat-reflective materials and expanding emergency response efforts for extreme heat events.
  • More Natural Shade: Planting more trees and implementing shade policies to cut down on heat absorption and improve air quality.
  • Watch the full webinar here:

    Download the webinar slides here:

    Ryan Stevens Presentation Slides

    Dr. Jennifer Vanos Presentation Slides

    Learn more about our experts

    Ryan Stevens

    Stevens is a Civil Engineer for Phoenix’s Street Transportation Department, managing the city’s $200M pavement programs, including the Cool Pavement Pilot. He shared Phoenix’s plans for cool pavement initiatives and outlined the city’s next steps in addressing heat mitigation.

    Dr. Jennifer Vanos

    Dr. Jennifer Vanos is an associate professor in ASU’s School of Sustainability, specializing in climate change, extreme heat, and human health. She led the City of Phoenix Cool Pavement Pilot Projects in 2020 and 2022. Dr. Vanos broke down key findings from the ASU Cool Pavement Study Phase II and discussed how CoolSeal is reducing urban heat islands and enhancing community health.

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