Does Cool Paint Technology Work? The Science Behind Keeping Your Roof Cool

When it comes to keeping your home cool, especially during scorching summer months, the type of paint you use on your roof can make a significant difference. But does “cool paint technology” really live up to the hype? A recent study conducted by Marley’s paint manufacturing partner set out to answer this question by comparing a high-quality white roof paint (similar to Marley M22 Ultimo) with a leading cool technology paint.

Let’s dive into the details and see what the study revealed.

The Test Method

To determine which paint performed better at keeping roofs cool, the study used a straightforward and scientific approach:

  1. Test Panels: Two paints were applied to a galvanized panel measuring 3.295m x 0.515m. Each paint was applied in two coats, with a 1.262m gap left unpainted in the middle.
  2. Temperature Measurements: After the paint dried, temperature readings were taken at five different points on both the painted and unpainted sections of the panel. Measurements were also taken on the back of the panel to assess heat transfer.
  3. Rotation & Averaging: The panel was rotated every hour, and readings were taken over four hours to ensure accuracy. Nine dry film thickness (DFT) readings were also recorded and averaged.

The Results

The findings were both surprising and insightful:

  • Front of the Panel: The high-quality standard white roof paint (similar to Marley M22 Ultimo) performed 1.16% cooler than the cool technology paint.
  • Back of the Panel: The standard white paint outperformed the cool technology paint by 2.46%, showing better heat reflection and reduced heat transfer.
  • Overall Cooling Effect: Both paints significantly reduced the temperature of the galvanized sheet by approximately 31% (around 15°C) compared to the unpainted section.

The Conclusion

The study confirmed that a high-quality roof paint like Marley M22 Ultimo in white is not only effective at cooling your roof but also provides a durable, long-lasting coating. While cool paint technology is often marketed as a superior solution, this test showed that a well-formulated standard white paint can deliver comparable—if not better—results.

Want to Take It a Step Further?

If you’re looking to maximize your home’s energy efficiency and comfort, consider Marley’s dual insulation system. This innovative approach combines two powerful solutions:

  1. Marley’s Radiant Barriers: These barriers stop heat transfer from the sun in its tracks, keeping your home cooler during the summer.
  2. Marley’s Polywool Insulation: Made from recycled polyester, Polywool acts like a duvet for your home, sealing off the roof loft to prevent heat from escaping during winter.

Together, these systems ensure your home stays cooler in summer and warmer in winter, reducing energy costs and enhancing comfort year-round.

Final Thoughts

When it comes to keeping your roof cool, the choice of paint matters. A high-quality product like Marley M22 Ultimo in white offers excellent cooling performance, durability, and value. And if you’re ready to go the extra mile, Marley’s dual insulation system can take your home’s energy efficiency to the next level.

So, whether you’re repainting your roof or upgrading your insulation, Marley has the solutions you need to create a more comfortable, energy-efficient home.