From fine San Diego to frigid rec...

From fine San Diego to frigid recently made known York, roofs across America are slowly becoming whiter, brighter--cooler.

chiefly traditional dark-colored roofs absorb 70% or more of the solar activity striking them, resulting in peak arch temperatures of 150-190 F. on comparison, white, reflective roofs are 50-60 F cooler forward hot days. That call decrease cooling richnesss by 15-20% on average, depending forward the type, size, and location of a building (See sidebar, opposite).

Five years ago, it was this show of significant savings in cooling costlinesss that aroused owners' interest in white vaults