Roofs are expensive to maintain and even more expensive to
replace. As part of an aggressive maintenance program, roof coverings applied
to a roof system in relatively good condition can extend the system’s service
life for many years, delaying replacement.
Coatings provide a renewable surface that protects the
underlying membrane from exposure to ultraviolet (UV) light and heat, slowing
the roof’s aging process. Highly reflective white coatings also significantly
reduce the membrane’s temperature, which leads to improved long-term
performance of the system. This lower temperature also reduces the building’s
heat load, resulting in lower cooling costs for the building.
Reflective coatings can reflect 60-85 percent of solar
energy. But managers should be aware that solar reflectance changes as a
coating ages. A high-quality reflective coating can quickly pay for itself in
energy savings. White roofs have a tendency to collect dirt, and the amount of
dirt typically depends on the roof’s slope, weather conditions, rainfall, and
surrounding elements.
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