• Camara Slate Products

• Cedar Roof Ontario

• Cedar Shake & Shingle Bureau

• Cedar Valley Shingle Systems, Inc.

• Cellwood Products

• CertainTeed Corporation

• Classic Products

• Concord Sheet Metal Products

• Copper Development Association Inc.

• CopperCraft

• Cox Industries Inc.

• Cumberland Woodcraft Co.

• Custom Shingles

• DECRA Roofing Systems

• DuPont Tyvek Weatherization Systems

• Dura-Loc Roofing Systems Limited

• EMCO Building Products

• Echeguren Slate, Inc.

• Elk Corporation

• Elk Corporation

• Eternit, Inc.

• Evergreen Slate Company, LLC

• Flame Stop, Inc.

• Fraser Cedar, Canada

• Fraser Cedar, USA

• G-S Company