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  • The natural slate is rigid and strong, like a piece of glass.
  • The quality, color and longevity vary depending on where the slate was quarried. The main quarries today are in Virginia, Pennsylvania, Vermont and New York.
  • Slate roofs are fireproof, strong enough to resist hail storms, aesthetically appealing and can last a century or even longer.
  • They are mainly installed on steep roofs.
  • The main types of slate in the United States are:
  • Sea green slate - a long lasting roof slate that is also known as fading gray-green slate, for its fading color due to weathering. This is a hard slate from Vermont with a life expectancy of about 150 years on average.
  • Purple slate – stays a dark purple color throughout its life. This is an excellent slate with a life expectancy of 150+ years and these roofs are highly restorable.
  • Unfading green slate – an excellent light green slate that could last 200 years or more.
  • Pennsylvania black slate - a softer slate roof material, last up to 70 -125 years.
  • Peach Bottom slate - dark black, hard, and long lasting with a life expectancy of 150-200 years.
  • Monson slates - also a dark black slate that is quarried in Maine and last about 150 years.
  • Buckingham, or Virginia Slate – a gray-black slate with a life expectancy of about 150 years. This slate contains countless tiny silica crystals it hat gleam when viewed in the sun, a unique characteristic of Buckingham slate.
  • NY Red Slate - a very high quality slate with a life expectancy of 150-200 years.