What Is A “Cool Roof” Anyway?

What’s So Cool About A Cool Roof?

A cool roof is one that reflects the sun’s heat and emits absorbed radiation back into the atmosphere.  The roof literally stays cooler and reduces the amount of heat transferred to the building below, keeping the building a cooler and more constant temperature.  Imagine wearing a white or a black T-shirt on a hot day.  By wearing the white T-shirt you will remain cooler than if you wore a black T-shirt because it reflects more sunlight and absorbs less heat.  A cool roof is like a white T-shirt, they keep the internal temperature of the building cooler.

However, a cool roof need not be white.  There are many “cool color” products which use darker-colored pigments that are highly reflective in the near infrared (non-visible) portion of the solar spectrum.  With “cool color” technologies there are roofs that come in a wide variety of colors and still maintain a high solar reflectance.

The two basic characteristics that determine the ‘coolness’ of a roof are:

  • Solar reflectance (SR)
  • Thermal emittance (TE)

Both properties are rated on a scale from 0 to 1, where 1 is the most reflective or emissive.

Cool roof is a term used to describe roofs that reflect light instead of becoming hot.  According to a paper presented by Lawrence Berkeley National Laboratory, if every roof and area of pavement in the 100 largest cities in the world were to switch to a cool roof and more reflective pavement, the reduced heat would offset 44 metric gigatons of greenhouse gases – an amount greater than all the greenhouse gases emitted by all the countries on our planet each year.

United Roofing & Remodeling is the leading commercial roofing contractor for high-performance roofing systems for commercial and industrial properties in the Twin Cities. Our expert sales staff will work closely with you to custom tailor a job to fit your needs.  Whether maintaining a specific budget, acquiring a desired warranty, saving energy or developing a tapered insulation system, we have the solutions and capabilities to solve your commercial roofing problems.

Contact United Roofing & Remodeling for all of your commercial roofing needs at 612-617-1717
Or Request a Quote online


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2 Responses to “What Is A “Cool Roof” Anyway?”

  1. Drew Abussell Says:

    It delivers various benefits to home owners like enduring aesthetics for house designs and much greater protection for the owner as it is a genuine symbol of durability. As for the home builder, a concrete roofing tile greatly improves the marketability of the property.

  2. Lyons Says:

    There are many different areas where your roof can leak. I always felt it is important to isolate the problem area and get it fixed as soon as possible. Remember, it is important to have regular roof inspections done to ensure its integrity isn’t compromised.

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