What effect does ponded water have on aluminum coatings?
Aluminum coatings do not perform well on roofs that pond water. Dirt can accumulate in depressions and inhibit the reflectance of the coating. If an aluminum coating is under water for a prolonged period of time, the water may work its way under the coating causing it to peel. Positive drainage is needed to flush away surface dirt and retain the reflective properties of the aluminum coating.
