Founded in 1886, GAF Materials Corporation has grown to be North America’s largest roofing manufacturer. Its flagship brand is the Timberline architectural shingle.

In 2007, it acquired Elk Corporation, another significant roofing manufacturer. Annual sales for the two combined companies are approximately $2.5 billion.

In addition to roofing, the company offers other building materials, such as decorative stone, composite decking and railing, fiber-cement siding, specialty fabrics, and metal ductwork.


TAMKO Building Products, Inc. is the nation’s leading independent manufacturer of residential and commercial roofing products, waterproofing, composite decking and railing systems, and cements and coatings.

With more than 60 years in the industry, TAMKO’s success is the direct result of teamwork, enduring relationships with customers, suppliers and employees, and its commitment to Six Sigma continuous quality improvement with its foundation based on the total quality management principles of Dr. W. Edwards Deming.

Owens Corning

Owens Corning is making headlines as a world leader in building materials systems and composite solutions. Owens Corning is a leading global producer of residential and commercial building materials, glass fiber reinforcements and engineered materials for composite systems.


EcoStar is the leading manufacturer of sustainable, environmentally friendly steep-slope roofing products. Created with a simple goal: to manufacture premium steep-slope roofing products using rubber and plastics technology, EcoStar has built on this premise for the past ten years.


CertainTeed has earned a reputation as a premier building materials manufacturer for more than 100 years. For every part of the building, CertainTeed offers a quality line of roofing, vinyl and fiber cement siding, pvc trim, sheathing, fence, railing, decking, foundation, windows, insulation, gypsum, ceilings, and pipe products for both residential and commercial building applications.

Decra Stone Coated Steel Roofing Systems

DECRA®, the original stone coated steel roofing system, represents a perfect blending of over 50 years of research and practical experience. Offering the ultimate in performance and engineering design is what DECRA Roofing Systems are all about.