Locations

Blue Ridge Summit, Pennsylvania

SGI’s "Charmian" plant is located in Blue Ridge Summit, Pennsylvania. Built in 1923, today the site employs over 150 employees. The Charmian facility contains an open pit quarry that mines meta-basalt rock, which is crushed and screened to produce raw granule production feedstock. These raw granules are then either converted into colored roofing granules or headlap, uncolored granules used on the unexposed section of shingles. The Charmian site also manufactures back surfacing material for shingle underlay. A new back surfacing plant constructed in 2014 has enhanced the manufacturing process of that product. The Charmian facility has seen continued growth through significant investments made in the quarry, mill, coloring plant, and product storage areas of the business. The Charmian plant ships its products by truck and on the CSX railroad.

ANNAPOLIS, Missouri

Built in 1965, SGI’s Annapolis, Missouri plant today employs over 150 employees. The facility contains an open pit quarry that mines rhyolite rock, which is crushed and screened to produce raw granule production feedstock. These raw granules are then converted into colored roofing granules before being shipped to roofing customer’s facilities primarily in the mid-west and southern United States. The Annapolis site has expanded through significant investments made in secondary crushing and drying, milling, and product storage over the last several years. The Annapolis plant ships its products primarily by rail on the Union Pacific Railroad.

Ione, California

SGI’s Ione plant is located 50 miles southeast of Sacramento, California. Through the addition of the Ione plant, SGI became a national provider of roofing granules. With 54 employees, the Ione facility contains an open pit quarry that mines meta-basalt rock, which is crushed and screened to produce raw granule production feedstock. These raw granules are then either converted into colored roofing granules or headlap, uncolored granules used on the unexposed section of shingles. The full range of products produced at the Ione facility are sold to roofing manufacturers in the western United States. Continued investment in the quarry, mill, coloring plant, and product storage areas of the business has driven steady growth at the Ione facility. The Ione plant ships its products by truck and by rail on the Union Pacific railroad.

PEMBINE, Wisconsin

SGI’s "Kremlin" plant is located 100 miles north of Green Bay, Wisconsin. Built in 1939, today the Kremlin site employs over 100 employees. The facility contains an open pit quarry that mines meta-andesite rock, which is crushed and screened to produce raw granule production feedstock. These raw granules are then converted into semi-ceramic coated colored roofing granules before being shipped to roofing customer’s facilities primarily in the mid-west. Over the last several years, the Kremlin site has increased its focus on quarry development to expose long-term rock reserves. It has also expanded the primary, secondary, and tertiary crushing and drying process to improve down-stream crushing and screening production. The Kremlin plant ships its products primarily on the Canadian National railroad.

Hagerstown, Maryland

SGI’s headquarters and Technical Center are located in Hagerstown, Maryland. In 2016, the Technical Center’s R&D laboratory was renovated to provide a state of the art facility dedicated specifically to mineral roofing and aggregate materials. The Technical Center services all of SGI’s manufacturing locations and monitors daily baserock feeds at each plant to ensure they meet demanding specifications for performance, durability, and environmental impact. In addition, every production run of colored granule product is included in SGI’s extensive weathering program and tested to ensure quality specifications are met.









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