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• The UV rays of the sun are problematic as well, attacking the asphalt and causing it to become brittle and cracked. The granules--those pulverized stones or glazed ceramic pieces that give a shingle its color--function as a "UV umbrella" to shield the asphalt from the sun.

  Eventually after several thousand heating and cooling cycles, the asphalt loses its ability to contract back into its original shape and the granules start to fall out, exposing the asphalt underneath to the sun.

  At this point, the roof will start to look scuzzy. It may be several years before the roof actually begins to leak, but "most people don't replace a roof when it starts to leak, they replace it when it looks bad," said Tom Bollnow, technical director for the National Roofing Contractors Association.

  How many years does it take for a roof to look bad? Climate clearly affects low long a given manufacturer's "25 year" shingle will really last; so will its color. Across the southern half of the US, with longer summers and more intense sun, dark colored shingles will absorb more heat and age faster than lighter ones. In the northern half of the US, color is less significant, said Greg Malarkey, senior vice president of Malarkey Roofing Company, an asphalt shingle manufacturer in Portland, Oregon.

Nothing brings more striking role in the feel and protection of your dwelling house than roofing and siding. They are the substantial obvious elements of your house, and they are the most important thing people recognize when they stop or walk by your home. They are as well your primary protection against rainwater, snow, wind and inclement weather.

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