Vt Slate Company

Posted By admin On 12/04/22
  1. Vermont Slate Company® is positioned to bring the slate roofing industry into the 21st century by providing unequaled quality and selection combined with the talent and dedication of our staff and national sales representatives. Slate roofing is a mark of prestige and quality.
  2. Vermont Mottled Purple Slate Roofing. In Vermont Mottled Purple slate, purple and green combine to form unique patterns in each slate.Some pieces are mostly purple and may be called “Dark Mottled,” while at the other end of the range, green predominates and can be known as “Light Mottled.”.
  1. Vt Slate Company
  2. Vermont Structural Slate Company

The Slate Valley of Vermont is renowned for producing the world’s best quality slate. With only one exception — the unique Unfading Spanish Black — Greenstone Slate is manufactured into roofing slates in our Poultney, Vermont facilities. All Greenstone slate colors have been tested and meet the S1 ASTM engineering specification, (ASTM C406*), which means they exhibit all the physical characteristics of the best quality slate available.

Handcrafted products from Vermont and New England. While we source sustainable products from all over the globe, we have a special place in our hearts for those made right in our backyard. Support Local Makers. Shop Local Handcrafted products from Vermont and New England.

Please note that slate color will vary somewhat because it is natural stone. The stone you receive will have its own unique natural color characteristics and in fact, your roof will be entirely unique — no other roof will be quite like it. The slate photographs on our website and in our literature are representative of the color categories of slate and a guide to what you can expect for your roof. Further, the way various devices/media represent the images you see will vary. Whether phone, tablet, desktop computer, TV or other device, none will display our photos in exactly the same way.

Get actual samples! Call us at 800 619 4333 to talk to us about getting actual slate samples for review. Please keep in mind however, that your slate delivery will still exhibit its own unique visual presentation!

Vermont Strata Gray

Vermont Gray Black (Briar Hill)

Unfading Spanish Black

Vermont black slate

Non-weathering Purple

Also available…

The available inventory of the below listed slate colors is dependent on the seasonal availability of that specific slate’s quarry. As with all Greenstone Slate, they also meet or exceed ASTM requirements as an S-1 rated roofing slate.

Vermont Clear Black (Semi-weathering)

This slate is an excellent hard-vein slate in shades of black. When weathered, 10-25% of slates will transform to chocolate and dark buff shades. The aesthetic result is a dark multi-toned roof with an abundance of character and surface texture.

Royal Purple (Semi-weathering)

Although this slate is a rich purple color, some pieces may have small markings of green. These durable Vermont slates are a favorite of architects and owners for custom homes where they are blended with other slates to create multi-colored roofs. Royal Purple slates are also popular on their own, as a roof covering for commercial, university and religious buildings. Royal Purple slates have historically exhibited a minimal amount of weathering.

Variegated Purple (Semi-weathering)

This slate has a predominately purple tone, with some having spots or streaks of green of varying size. In some slates, green maybe predominate with only tints of purple. Typically, in comparison to royal purple, a greater percentage of Variegated Purple slates will change upon exposure to shades of tan. As a result of its weathering characteristics, a vast array of colors can be expected. This makes variegated purple an excellent choice in color blends.

Non-weathering Red

This is a hard-vein red slate with excellent color, cleavage, and strength. This color becomes more pleasing with age. The dominant earthy red tone makes it an excellent choice as an accent color or for use in patterned slate roofs.

Additional Resources

  • Learn more about roofing slate quality
  • Historic Vermont Slate Roofing: A Colorful Search for Answers: Jon Hill of Greenstone Slate gives practical thoughts on matching newly quarried slate for historic repair. Read article

Important information about slate colors, weathering and fading

There are thousands of slate roofs still in service today installed in the 1800’s! With such a long history, many terms describing the material have been coined and over the years some have evolved into misinterpretation. For example, a common misconception associated with the nomenclature of describing slate occurs when the terms weathering and fading are erroneously interchanged. Below is a clarification of slate terms:

Nomenclature of Slate

Fading: The term “fading” refers to certain slates that after prolonged exposure to the elements exhibit a chalk-ashen residue on the exposed surface of the slate. The chalk-ashen residue is the result of a chemical reaction and the associated release of calcium from the body of the slate. This release weakens the structural integrity of slate and is detrimental to the slate’s life expectancy. The term is most often used in conjunction with the Blue Black or Black slates of Pennsylvania and Virginia.

Non-fading or Unfading: These terms refer to certain slates that after a prolonged exposure to the elements do not produce the chalk-ashen residue. “Non-fading” or “unfading” slates usually have greatly extended life expectancies over those slates prone to calcium release.

Classification of Colored Slate

Vt Slate Company

Colored slate does not fade, but it will experience varying degrees of color change. This weathering of slate is due to the oxidation over time of minerals embedded in the slate. Depending on mineral content, the weathering process slowly changes the slate color. The color change is often a movement toward buff, brown, gray or tan. This surface oxidation is not detrimental to the slate’s structural integrity and does not shorten the life of a roof. Colored slates are classified in three types, based upon the degree of color change over time:

Weathering: The term “weathering” refers to slates that will exhibit the largest number of individual pieces that will transform from the original color to an earth tone.

Non-weathering: The term “non-weathering” refers to slates that exhibit the least amount of color change.

Semi-weathering: The term “semi-weathering” refers to roofing slates that have varying mineral content. Some of these slates will undergo a color change while others remain their original shade. The percentage of semi-weathering slates that will experience color change is variable depending upon the location in the quarry from which the slate was extracted.

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Vt Slate Company

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About Greenstone Slate CompanyOur quarries in Vermont have, for over a century, produced an exceptionally fine quality stone for roofing slate. High quality stone is just the beginning, however. Our stone is worked only by Greenstone trained craftsmen. Our production facilities are constantly updated and expanded. This has lead Greenstone Slate to become a principal producer of colored slate roofing. We deliver consistently high quality product, with excellence in service and installation support, and competitive, direct pricing' for the highest value possible in a slate roof.Greenstone Slate Company is a third generation Hill family business with quarries and facilities operating in Vermont and New York State. Most of these quarries share a similar history since slate mining was a cottage industry for local construction from the Colonial Era until after the Civil War. Until the advent of a viable railroad system, roofing slate production was extremely limited due to the difficulty of transporting heavy stone to eastern cities. After the Civil War the railroad line from New York City to Albany was upgraded and extended into the slate-producing regions of Vermont. Greenstone's present Poultney, Vermont quarries were divided into several leases ; the largest of which was conveyed to the 'Auld and Conger Slate Company, ' a Welsh business around 1882. Production from the leases increased steadily for the next thirty years and reached its peak around 1915 when the Poultney quarries produced 20, 000-30, 000 squares of roofing slate per year with a work force of several hundred employees.The Great Depression of 1929 decimated the entire slate industry and the few surviving quarries were extremely small operations with a handful of employees ; usually family members. World War Two dealt a further blow to the industry as slate production was considered non-essential and the local workforce either entered the military or worked at the large defense plants located in metropolitan areas.After World War II, the first quarry to be re-opened on the Greenstone property was known as the 'Culver Slate Company It was a very small operation with three or four employees located on a small lease of Greenstone's present sea green vein in Poultney. The property had been part of what was known as the Nathaniel Griffith Lease, and in 1955 Ernest I. Hill began production. The quarry, and the equipment located there, had been neglected by years of little use or maintenance. Two of the large veins had been covered with rubble by Depression era cost cutting efforts, and it took more than a year to remove the debris and expose the high quality slate hidden below. By 1962, all of the Poultney quarry leases had been acquired by Mr. Hill and in 1971, additional quarries containing stone reserves were acquired from the town of Wells, Vermont. Ernest Hill continued his operation of the quarries as a proprietorship until 1980 when the company was incorporated as 'Quarry Slate Industries, ' and later re-named the 'Greenstone Slate Company.'In 1985, after Ernest Hill announced his retirement, his son Richard Hill took over of the entire manufacturing operation. His insight and similar visions of growth for Greenstone became the catalyst for even further expansion. Under his management Greenstone Slate Company acquired the Penrhyn Hill quarries in nearby Middle Granville, New York. Recently, in keeping with family tradition and commitment to the future of Greenstone's position within the industry, the company has acquired the Briar Hill Quarries. This tremendous acquisition, under the direction of Ernest Hill's grandson Jonathan Hill, consists of over 225 acres of enormous mineral reserves. The Echo, Bull Moose, Owens and the Big Boston quarries have historically produced vast quantities of Vermont Sea Green and Vermont Gray Black.The Briar Hill Quarry has significantly enhanced Greenstone's production capabilities. One of the most outstanding aspect

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