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• Shingles were once differentiated by weight, which indicated the amount of asphalt in the shingle. Then, about 20 years ago, as more and more manufacturers switched to making shingles with fiberglass cores that did not require as much "black gold," they began to categorize shingles by their projected years of useful life. Since there is no industry wide standard for what constitutes "40 years," "30 years" and so forth, this designation has been left to individual manufacturers to determine. As Peter Kelly, Managing Director of the Asphalt Roofing Manufacturers Association said, "it's up to the manufacturer to define what '25 years' means."

  In the absence of manufacturing precision, some explanation of asphalt shingle mechanics may be helpful. The key factors are time and temperature. The hotter asphalt becomes on your roof and the longer it stays hot, the shorter its useful life will be. A shingle in Phoenix, Arizona will not last as long as one in Detroit. Even seemingly benign weather will heat up a roof. When the air temperature is a mere 75 degrees, the roof surface can easily reach 140 to 160 degrees.

  The heat causes the asphalt to expand; the hotter it gets and the longer it stays hot, the longer it will be in a "stretched" position. When the sun goes down, the asphalt contracts back into its original position.

Nothing brings more prominent part in the feeling and shelter of your house than roofing and siding. They are the significant obvious factors of your house, and they are the first thing people notice when they stop or pass by your home. They are as well your principal protection against rainwater, snow, wind and inclement weather.

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