Using Cool Roofs to Reduce Heat Islands

An excessive sun reflectivity – or albedo – is the maximum critical feature of a groovy roof as it allows manual daylight and warmth away from construction while lowering the roof’s temperature. A high thermal emissivity also plays a role, especially in hot and sunny climates. Together, these properties help roofs absorb less heat and remain cooler than conventional materials by 50–60 °F (28–33 °C) during peak summer weather. This paint stops whatever heat comes directly from the sun on the roof of the houses and allows it to come inside the house only in a very small amount, which keeps the house cool.

Building owners and roofing contractors have used cold roofing products on commercial, industrial, and residential buildings for over 20 years. They can be installed on low-slope roofs (such as the flat or gently sloping roofs commonly found on commercial, industrial, and office buildings) or the steeply sloping roofs used in many homes and retail buildings.

Through the A Good Cool roof Paint program, the EPA and the Department of Energy (DOE) help consumers and other buyers identify the most energy-efficient roofing products. Good Cool Roof Painted roofing material meets minimum solar reflectivity and reliability criteria. Based on 2006 data from more than 150 Energy Star partners, shipments of Cool Roof products have grown to represent more than 25 percent of these manufacturers’ commercial roofing products and about 10 percent of their residential roofing products.

Benefits and costs

Cool roofs offer many benefits beyond urban heat island mitigation, including:

  • Less energy use: A cooler roof transfers less heat to the building below, so the building stays cooler and uses less energy for air conditioning.
  • Reduced Air Pollution and Greenhouse Gas Emissions: By reducing energy use, cool roofs reduce the production of associated air pollution and greenhouse gas emissions.
  • Improved human health and comfort: Cool roofs can reduce the air temperature inside buildings with and without air conditioning, helping to prevent heat-related illnesses and deaths.

Cold roofs deflect some of the desired heat gains during the winter. In general, however, cool roofs result in net energy savings, especially in areas where electricity prices are high. You also live happily on a cold roof, if it is hot then you will find it very difficult to live in it and you will use air conditioning due to heat and your electricity consumption will be high, which will increase the electricity bills of the house and this starts becoming the biggest problem. To avoid this, you can use good quality and quality sun reflective paint so that you will save on the electricity bills of your homes and you can live peacefully feeling cold in homes without air conditioning.

A California study found that cool roofs provide an average annual net savings of about 50 cents per square foot. This wide variety is because of the charge top class for cool roofing merchandise and extended heating charges in winter, in addition to electricity financial savings in summer, financial savings from lowering cooling equipment, and the longer life of cool roofs compared to traditional roofs. With less labor and material cost involved.

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