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Cool Roofs

A “Cool Roof” is defined as a roof surface that has both high reflectivity and high emissivity. High reflectivity requires the surfacing material to reflect solar energy away from the surface. High emissivity requires radiating heat energy away from the surface. Roofs undergo significant expansion and contraction as they heat and cool throughout the day. Heat absorbed by the roof can also accelerate degradation by ultraviolet rays and water. A reflective roof can reduce the amount of thermal shock that occurs on the roof surface and prolong the life of the roof.

Sealoflex is a member of the COOL ROOF RATING COUNCIL (CRRC)

Sealoflex Products rated by the CRRC:

PRODUCT
SOLAR REFLECTANCE
THERMAL EMITTANCE
SRI (Initial) 3 yr-pending
SLOPE
Sealoflex Enviroflex 0.83 0.91 104  Low/Steep
Sealoflex Finish Coat White 0.85 0.92 107 Low/Steep


An important factor in the Cool Roof Concept is that of Solar absorptivity. Solar absorptivity is a fraction which represents the difference between how much solar radiation is absorbed by a material versus that which is absorbed by a standard black surface. Since black (dark) surfaces absorb more solar energy than lighter colors (i.e., do not reflect as much), those surfaces are warmer. The Solar Absorptivity Chart represents this principle.


HOW COOL ROOFS WORK:

Roof Reflectance Properties2 

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