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Cool roofs reflect and emit the sun’s heat back to the sky instead of transferring it to the building below.


Roofing materials that have high solar reflectance and high thermal emittance are referred to as “cool” roofing materials. 

Two primary properties determine roofing products coolness:

Reflectivity - How much of the sun’s heat is reflected away from the roof rather than absorbed.

Emissivity - How effectively the absorbed heat is released from the roof after the heat source is removed.
 
Cool Roof Benefits

Lower roof surface temperatures may reduce the total cooling load on the building resulting in a less peak electrical demand.

Significant energy savings may be realized.

Lowering roof surface temperatures will enhance the durability of a roof and substantially improve the longevity (life) of a roof.

Lower roof surface temperature will increase the overall efficiency of the roof system.  

Lower roof temperatures mean a reduction in air-conditioning loading requirements.  Reduced HVAC cost (Equipment & Usage)

Cool Roofs

Source:  CRRC - Cool Roof Rating Council