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How does a reflective roof coating make a roof “cool?”

Nearly any roof can be converted into a “cool” roof by applying a reflective roof coating. This can be achieved at any time during the life of the existing roof. These coatings can be applied to new and existing dark-colored roofs. A reflective roof has properties of at least 65% reflectivity and 50% emissivity after 4 years of aging. It reflects solar energy back into space so the roof surface remains cooler. A “black” roof becomes incredibly hot in the heat of summer, with this solar energy is getting absorbed into the building. The installation of a reflective coating not only reduces the surface temperature and heat transfer into the structure, it also acts as one of the best against water penetration.

What are the benefits of using a reflective roof coating? It can specify a simple, green, sustainable solution that saves building owners and facility managers money, eases installation for contractors, and can meet, satisfy, or contribute to Title 24, LEED, and other green rating system requirements.
  1. Reduces the temperature inside the building it covers by 6-9 degrees
  2. Reduces the roof surface temperature by up to 50%
  3. Increases the effective “R” value of insulation
  4. Increases the efficiency of roof-mounted HVAC units
  5. Saves on the cost of air conditioning the building
  6. Results in lower energy costs overall to the building owner by reducing the “peak electrical demand” level
  7. Creates a more comfortable environment in areas where there is no air conditioning
  8. Slows premature aging of a roof due to high surface temperatures and UV degradation
  9. Results in reduced overall roof life-cycle costs
  10. Reduces respiratory health risks 
  11. Offers your clients a cost-effective method of meeting their roofing needs

And it’s environmentally friendly (“green”) because it:
  1. Reduces landfill materials – at least 10% of landfill waste is made up of roofing materials
  2. Saves energy, both for the building owner, and for the utility supplier
  3. Results in a reduced carbon footprint of the building by reducing the CO2 emissions
  4. Minimizes the overall environmental burden
The cost of applying a reflective roof coating is a good investment

Yes, applying a reflective roof coating is an excellent investment.* If the installation costs for a reflective roof coating (which vary) are slightly higher in certain situations, the long-term benefits can easily offer an attractive return on the installation investment, by providing:

  1. Longer roof life, better durability—coatings protect the roof substrate from destructive UV
  2. Reduced maintenance costs over the life of the roof; and coatings can provide the added bonus of being a water-resistant barrier
  3. Better budget management due to predictable life extension of the roof (the opportunity to re-coat the roof rather than replace it)
  4. Reduced installation risks
  5. Minimal disruption to the occupants, operations during application, construction process, saving money in areas other than the roofing materials and application itself
  6. A more desirable and comfortable work environment inside the building
  7. Opportunity for energy credits, tax savings, rebates

Thermal insulation coatings are primarily used for roof coatings but can be used on walls and other hot surfaces. They come in white, cool colors and clear.