Producer
Specialty Granules LLC (SGI)
Leading US roofing granule mining and processing company; 100+ year history; 700 employees; supplies granules for 2.5M+ North American homes annually. Mines limestone and other minerals, applies ceramic coatings, and distributes to shingle manufacturers including GAF, Owens Corning, and CertainTeed. Owns PVL limestone operation.
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Goods downstream
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Facilities
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Stories
What they make
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Goods downstream
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Where they make it
2 facilities
SGI — PVL Limestone Operation →
USMaryland/Virginia · mine
Captive limestone quarry (PVL, an SGI company) supplying base mineral for granule production; vertical integration from quarrying to ceramic coating.
Specialty Granules (SGI) — Hagerstown MD Operations →
USMaryland · mine
Primary US roofing granule mining and processing hub; limestone base mineral mined locally; ceramic coating applied on-site; distributes to major shingle plants in Mid-Atlantic and Southeast.
What else they do
Business segments
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Roofing Granules (Ceramic-Coated)
75%Building Aggregates
15%Agricultural Minerals
10%
Intelligence
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Origin2023
Specialty Granules was founded in the early 20th century in Hagerstown, Maryland — a city in the Cumberland Valley at the base of the South Mountain ridge of the Appalachians. The Cumberland Valley running northeast-southwest from Pennsylvania through Maryland contains some of the most economically valuable limestone deposits in the eastern US, and the South Mountain ridge quartzite and other mineral deposits provided the specific stone characteristics needed for roofing granules: sufficient hardness to resist crushing and weathering, appropriate mineral composition for ceramic coating adhesion, and the right particle size distribution for asphalt shingle embedment. SGI developed the ceramic coating process that gives modern asphalt shingles their varied colors — the gray, brown, green, and blend colors that dominate residential roofing in North America are applied in SGI's ceramic kilns before the granules are shipped to shingle manufacturers. GAF, Owens Corning, and CertainTeed depend on SGI and the three other US roofing granule suppliers (3M, IKO, and Lignified Stone) for the protective mineral surface that determines both the color and the fire resistance of asphalt shingles. SGI's Maryland quarrying operations supply the visual appearance of millions of American homes — the color visible from satellite images of suburban neighborhoods is substantially determined by SGI's coating chemistry.
Specialty Granules LLC ↗