Perhaps one of the most significant developments in the
low-slope commercial roofing industry during the past 15 years is
the increase in the awareness and adoption of the "cool" roofing
concept. Light-colored, reflective thermoplastic roof membranes
have been used in Europe since the 1960s and in North America since
the 1970s, and companies that pioneered the introduction of these
materials continue to innovate.
Despite the track record of some cool roof technologies, such as
thermoplastic PVC membranes and certain coatings, some critics
within the commercial roofing industry have attempted to cast
doubts regarding the fundamental science behind cool roofs, their
effects on energy in northern climates and their overall
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