THE NATIONAL SLATE ASSOCIATION - CHARLESTON, 2014
In early may, the NSA met in Charleston, SC for two and a half days of continuing education and strategic planning.   
The National Slate Association was first established in 1922 by producers of slate material. The goal was to promote the use of slate for roofing and structural applications. The standards set back then in slate roof materials and construction are still adhered to today. Shortly after its formation, the organization went inactiv...

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