How Much Can Painting a Roof White Reduce Its Temperature?

If you’ve ever had the misfortune of wearing a black shirt on a hot day, you probably realize that the color of a material affects its heat absorption. Something painted black absorbs more heat than other colors do, while something painted white absorbs significantly less (or even reflects) heat. This happens because black absorbs all visible wavelengths of light and white reflects all visible wavelengths of light. This could affect any industrial painting project you undertake in Utah.

If you hire an industrial painter in Utah, you might be asking yourself if painting your roof white is advantageous or not. Here are some answers.

How does a white roof or “cool roof” work?

Believe it or not, light contains energy. That energy then becomes heat. So, when a roof is painted white, it is reflecting the light shining down upon it. This, in turn, reflects a portion of the sun’s energy and heat.

Cool roofs don’t reflect all the heat that hits them—just significantly more than a black roof would. And depending on the climate in which you live and the size and shape of your building, this could make a big difference.

How much is the temperature reduced if a roof is painted white?

A Berkeley Lab study found that if a clean, white roof is able to reflect 80 percent of sunlight, then its surface temperature will be 31℃ cooler than normal on a regular summer afternoon.

A study conducted in Hyderabad, India found that by using a cool roof membrane, internal temperatures were reduced by 2℃ on average.

Sonia Seneviratne of the Swiss Federal Institute of Technology claims that creating lighter land surfaces could help to lower temperatures in Europe, North America and Asia by as much as 2-3℃.

How could a white roof impact my business?

Painting your roof white could lower your energy costs. This is because there will be less heat seeping into your building, meaning that your air conditioner won’t have to work as hard to maintain a cooler temperature. Because your air conditioner won’t have to work as hard, it won’t use as much energy, thus lowering your energy bill.

Are white roofs environmentally friendly?

Yes, cool roofs and especially white roofs are beneficial to the environment. This is because they reflect heat, thus, requiring less energy to cool them. Applied on a large scale, if thousands of buildings have white roofs, then that’s a considerable amount of energy being saved, and it could have a tangible effect on the environment.

Call to discuss your white roof today

As you can see, there are many benefits to hiring an industrial painter in Utah to paint your commercial building’s roof white. You will lower the surface temperature of both your roof and the interior temperature of your building, and you’ll save money as well as the environment by increasing efficiency and reducing your energy output. So give us a call at Great Western Painting for all your industrial painting needs in Utah. We can perform any type of commercial paint job for any application with a quality you’ll love and at a reasonable price.

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