“Slate Roof Evaluations and Design Considerations” was published in the January 2016 issue of RCI Interface. Below is an excerpt. Click here to read the article in its entirety.

 History of Slate in the United States

Slate has been used in the United States since the 1600s, with much of the early slate being imported from Wales in the British Isles. In 1734, the first recognized slate quarry was opened on the Pennsylvania/Maryland border. From this point onward, numerous quarries could be found in the northeastern states and through the central/mid U.S. (Oklahoma, Colorado, Utah, Nevada). Slate production in the U.S. peaked in 1902 with approximately 1.4 million squares of slate reportedly produced that year. The National Slate Association was formed in 1922 to increase product marketing, standardize slate sizes and manufacturing practices, eliminate product waste, and clarify the industry’s descriptive terminology.

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