In his article "Roofing's dirty secret," April issue, page 26, Tom
Hutchinson, principal of Hutchinson Design Group Ltd., Barrington,
Ill., points out some issues regarding reflective roofs that are
important for contractors. We at SPRI believe it is important to
provide additional insight and information concerning these
Just as cars and trucks get dirty, contractors also should
expect roofs exposed to the same environment will get dirty, too.
Car washes became popular years ago when some entrepreneurs learned
people valued clean cars for maintenance and technical reasons,
such as eliminating corrosive salt. Will the aesthetic and
technical value of a clean roof result in a new industry? That
question will remain unanswered until the total value equation is
developed, understood and implemented.
SPRI takes exception to Hutchinson's claim that "dirty roofs"
have been ignored by the industry. Quite the opposite, the soiling
of roofs has not been ignored by manufacturers, ENERGY STAR® or
the Cool Roof Rating Council (CRRC). In fact, SPRI members began a
study of the soiling of roofs in 1998 and published two papers
about the subject.
ENERGY STAR allows cleaning of roofs before their three-year
aged solar reflectance value is measured based on a belief that
rain just before sampling might clean a roof, as well. CRRC decided
cleaning a roof after three years of aging should not be done
because doing so may inappropriately affect the measured solar
reflectance. However, this concept has not been presented
aggressively enough to roofing contractors. Manufacturers aim to
more proactively help contractors...
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