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  • Has a base mat of glass fibers covered with ceramic-coated mineral granules.
  • Some types may use a polyester or fiberglass blend for the base mat.
  • An inorganic shingle.
  • Features a better fire rating and often has a longer warranty than other types of shingles.
  • Does not absorb water and resists cracking.
  • Most come with seal-down strips. These are most effective when applied in warm weather, which allows the asphalt in the strip to soften and adhere to the next shingle.
  • An inorganic-based shingle usually has a Class A fire resistance rating from the Underwriters Laboratories (UL). UL also tests for shingle performance in high winds. To qualify for the wind-resistance label, shingles must withstand test winds of at least 60 mph for two hours without a single tab lifting.

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