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Savecal.com - Inside Cool Paint | When speaking of cool paint, and cool roofing, it is
important to understand the science behind them. While throughout history this
concept has been utilised to keep our structures more comfortable, it is only
relatively recently that the idea has been understood. Two terms are the most
prevalent, solar reflectance and thermal emissivity.
Solar reflectance can be simply broken down to referring to the amount of light
reflected by a surface and is quantified on a rating of 0 to 1, with 1 reflecting 100% of
light waves, ultraviolet, infrared and visible. Thermal emissivity, or thermal
emittance, is the ability to disperse radiant heat, and is also judged on a scale of 0 to
1, though only determined in the infrared range. How these combine, and how the
concepts can be applied, give us a greater understanding of cool paint and how it
Albedo, derived from the Latin ‘albus,’ for white, is calculated by judging its
reflectance starting at 0, no reflection, for a completely black surface to 1, complete
reflection, as a perfectly white. Of course in practicality these ideals are not normally
Outer Cooler Surface Brings Lower Temperature in Interior paint, and cool roofing, it is
In naturally occurring substances most fall in the range of .04, for a dark object like
charcoal, up to .9 as seen with freshly fallen snow. When translating this into
achievable applications, a light colored paint that has been enhanced through highly
reflective additives can achieve up to .72, while older, untreated dark pigments can
be as low as .05. These numbers help to describe the benefits that can be obtained
through these new technologies.
When combined with the thermal emittance value we arrive at a Solar Reflectance
Index (SRI), quantified on a scale from 0, for standard black(reflectance.05, emittance
.9) to 100, standard white(reflectance.8, emittance.9) and a perfect SRI being 122,
designating a mirrored surface.
Again applying new technologies there have been SRI ratings up to 88, roughly
designating that these paints will reflect and emit nearly 90% of solar radiation.
While treated stainless steel roofing, widely considered to be the most effective,
landing in the range of 110 to 115. Correlated against a traditional black tar roof,
falling in around 10 on the SRI, this drastic disparity can very quickly justify the use of
these newly developed products.
Applying these measurement systems, and associated products, during the planning
and implementation of energy efficient building solutions can greatly benefit both
the bottom line savings, associated with maintaining a comfortable living
environment, and the overall asset of reduced energy consumption.
By actively promoting the use of high SRI products overall usage and correlating costs
can be easily and efficiently managed. Thus resulting in a more successful and
economical structure with lower energy demands and higher comfort levels. These
concepts, along with renewable energy production and other sustainable
environmental principles will surely guide construction in a viable and supportable
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Contact Us: - during the planning
Address: - 7842 Clybourn Ave Sun Valley, CA 91352
Contact No. (800) 616-9965