Greenville Cool Roof Coatings | Cool Roof Technology | Cool Roof Requirements Greenville SC

Energy Star® Cool Roof Coatings

The Cool Roof Program Americans spend about $40 billion annually to air condition buildings - sixth of all electricity generated in this country.
Cool Roof Technology - Power Factors - Atlanta
  • ENERGY STAR qualified roof products reflect more of the sun's rays. This can lower roof surface temperature by up to 100F, decreasing the amount of heat transferred into a building.
  • ENERGY STAR qualified roof products can help reduce the amount of air conditioning needed in buildings, and can reduce peak cooling demand by 10-15 percent.
  • Although there are inherent benefits in the use of reflective roofing, before selecting a roofing product based on expected energy savings consumers should explore the expected calculated results that can be found on the Department of Energy's "Roof Savings Calculator" website at www.roofcalc.com.

    Please remember the Energy Savings that can be achieved with reflective roofing is highly dependent on facility design, insulation used, climatic conditions, building location, and building envelope efficiency.

Cool Roofs Explained

A high solar reflectance (albedo) is the most important characteristic of a cool roof as it helps to reflect sunlight and heat away from a building, reducing roof temperatures. A high thermal emittance also plays a role, particularly in climates that are warm and sunny. Together, these properties help roofs to absorb less heat and stay up to 50–60°F (28–33°C) cooler than conventional materials during peak summer weather.
Cool Roof Coatings


Building owners and roofing contractors have used cool roofing products for more than 20 years on commercial, industrial, and residential buildings. They may be installed on low-slope roofs (such as the flat or gently sloping roofs typically found on commercial, industrial, and office buildings) or the steep-sloped roofs used in many residences and retail buildings.

Through the ENERGY STAR program, EPA and the Department of Energy (DOE) help consumers and other purchasers identify the most energy-efficient roofing products. Roofing materials with the ENERGY STAR label have met minimum solar reflectance 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 roof products and roughly 10 percent of their residential roof products.

Cool Roofs Benefits and Costs

Cool Roof Technology - Reflective Materials - Atlanta
Cool roofs provide a number of benefits beyond urban heat island mitigation, including:
  • ENERGY STAR qualified roof products reflect more of the sun's rays. This can lower roof surface temperature by up to 100F, decreasing the amount of heat transferred into a building.
  • ENERGY STAR qualified roof products can help reduce the amount of air conditioning needed in buildings, and can reduce peak cooling demand by 10-15 percent.
  • Although there are inherent benefits in the use of reflective roofing, before selecting a roofing product based on expected energy savings consumers should explore the expected calculated results that can be found on the Department of Energy's "Roof Savings Calculator" website at www.roofcalc.com.

    Please remember the Energy Savings that can be achieved with reflective roofing is highly dependent on facility design, insulation used, climatic conditions, building location, and building envelope efficiency.
Cool roofs deflect some desired heat gain during the winter. In general, though, cool roofs result in net energy savings, especially in areas where electricity prices are high.

Although costs will vary greatly depending on location and local circumstances, cool roof coatings on a low-slope roof might cost $0.75–$1.50 per square foot, while single-ply cool roof membrane costs vary from $1.50–$3.00 per square foot. The cost premium for cool roofs versus conventional roofing materials ranges from zero to 5 or 10 cents per square foot for most products, or from 10–20 cents for a built-up roof with a cool coating used in place of smooth asphalt or aluminum coating.

A California study found that cool roofs provide an average yearly net savings of almost 50 cents per square foot. This number includes the price premium for cool roofing products and increased heating costs in the winter as well as summertime energy savings, savings from downsizing cooling equipment, and reduced labor and material costs over time due to the longer life of cool roofs compared with conventional roofs.

Federal tax credits are available for ENERGY STAR qualified metal roofs and reflective asphalt shingles that are installed on existing homes. For details, please visit ENERGY STAR's Federal Tax Credits for Energy Efficiency page.

Solar Reflectance

Watch the difference Cool Roof Technology makes There are many types of roofing materials with a varying range of reflectance and emittance levels.

Asphalt shingles, the most common type of roofing material, are the least efficient at reflecting the sun's heat energy.
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The asphalt is composed of asphalt-saturated mats made from organic felts or fiberglass.

Roofing granules, one-millimeter sized stones coated with an inorganic silicate material, protect the roof from the sun's ultraviolet light. The coating contains microscopic pigment particles, similar to those used in paint, to provide color.

Asphalt's low solar reflectance can be attributed to several factors:
  • First, there is a limited amount of pigment in the granule coating.
  • Second, the roughness of the shingle contributes to multiple scattering of light and thus to increased absorption.
  • Third, the black asphalt substrate is not 100% covered by the granules, and reflects only about 5% of the light that strikes it.

Solar Reflectance Index

  • Solar Reflectance is the fraction of the solar energy that is reflected by a roof, expressed as a number between zero and one. The higher the value, the better the roof reflects solar energy. For example, white reflective coating or membrane has a reflectance value of 0.85 (reflects 85% of solar energy hitting it and absorbs the remaining 15%), while asphalt has a value of 0.09 (reflects 9%).

  • Emittance is the amount of absorbed heat that is radiated from a roof, expressed as a number between zero and one. The higher the value, the better the roof radiates heat

  • Solar Reflectance Index (SRI) indicates the roof's ability to reject solar heat, and is the combined value of reflectivity and emittance. It is defined so that a standard black is zero (reflectance 0.05, emittance 0.90) and a standard white is 100 (reflectance 0.80, emittance 0.90). Because of the way SRI is defined, very hot materials can have slightly negative SRI values, and very cool materials can have SRI values exceeding 100.


Cool Roof Q&A

Cool Roof Requirements Los Angeles CA
Question What buildings and roofing projects are subject to the Cool Roof Requirements of the Title 24 2005 building Energy Standards? Answer The 2005 Standards Cool Roof Requirements apply to roofs on conditioned ( cooled or heated ) non-residential buildings that have low-sloped roofs (2:12 or less). The Requirements apply to roofs on newly constructed buildings and to most re-roofs on existing buildings.

Types of Buildings Subject to Cool Roof Requirements

  • Group A - Assembly
    Building or structure, or portion thereof, for the gathering of 50 or more persons for purposes such as civic, scial, or religious functions, recreation, instruction, food or drink consumption, or awaiting transportation. Examples: restaurants, arenas, churches, theaters.

  • Group B - Business
    Building or structure, or portioned thereof, for office, professional or service-type transactions; includes storage of records and accounts and restaurants with occupant load less than 50. Examples: animal hospitals, kennels, automobile showrooms, banks, barber shops, outpatient clinic and medical offices, educational occupancies above the 12th grade, fire stations, florists and nurseries, testing and research labs, print shops, radio and TV stations.

  • Group E – Educational (through 12th grade)
    Building or structure, or portion thereof, for educational purposes through 12th grade for more than 12 hours per week or 4 hours in any one day. Examples: schools, nonresidential buildings used for daycare for more than six children, residential buildings used as daycare for more than 14 persons.

  • Group F – Factory (low and moderate hazard)
    Building or structure, or portion thereof, for fabricating, manufacturing, packaging, processing, etc. Examples: furniture manufacturing, bakeries, food processing plants, paper mills, printing or publishing facilities, refuse incineration, shoe factories, dry cleaning facilities.

  • Group H – Hazardous facilities
    Building or structure, or portion thereof, that involves the manufacturing, processing, generation or storage of materials that constitute a high fire, explosion, or health hazard. Examples: manufacturing plants for explosives, blasting agents, fireworks, flammable gases; storage facilities for such products.

  • Group M – Mercantile (sale of merchandise)
    Building or structure, or portion thereof, for the display and sale of merchandise. Examples: department stores, shopping centers, wholesale and retail stores, markets.

  • Group S – Storage facilities
    Building or structure, or portion thereof, for storage not classified as a hazardous occupancy. Examples: storage of beer or wine in metal, glass, or ceramic containers, of cement in bags, of foods in noncombustible containers, of gypsum board, of stoves, washers, and dryers.

  • Group U – Utility facilities
    Private garages, carports, sheds, agricultural buildings, and towers

You have questions, we have answers

Technology makes it easy When you call us, you will speak directly to roofing professionals that can answer the technical questions you have. To further our customer service outreach, we have developed a user-friendly online Free Estimates Form that enables you to get fast no-hassle pricing estimates for your projects, in writing!