Ultra Violet Radiation
As soon as a roof is installed the sun begins to deteriorate the material. Every single day (even cool and cloudy days) the UV rays from the sun damage and break down the roof. Under the exposure of UV rays of the sun, free molecules of oxygen mix with heated hydrocarbons in asphalt and deterioration begins.
Molecular breakdown by the sun dries out the oils in the roof. The roofing material becomes dry and brittle. Eventually it looses its waterproofing qualities.
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