The concept is very similar to wearing black in Arizona. If you wear something white instead, you will stay much cooler. This is because white reflects more of the AZ sun, as a result it absorbs less heat. However, Cool Roof’s come in many different colors, as there are a variety of cool roofing materials to choose from.
These are the two key elements that comprise a Cool Roof:
- Solar Reflectance (also referred to as Albedo). The fraction of solar energy that is reflected.
- Thermal Emittance This is a number or percentage that represents the level at which it can emit its absorbed heat; normally measured in a decimal form between 0 and 1.
Here’s a practical look at how this plays out.
By having a Cool Roof you can expect to keep your home or building much cooler. Meaning, your AC is working less – leaving you with a smaller electric bill at the end of the month. Additionally, you can expect to see less maintenance cost over your roof’s lifetime; speaking of lifetime, you can expect a longer one with a Cool Roof.
For additional resources on cool roofing materials: