• 3M Industrial Mineral Products

• ABC Supply Co., Inc.

• Aluminum Lock Roofing

• American Eagle Remodeling

• American Roof-Brite Inc.

• American Slate Company

• American Wick Drain Corporation

• Argo Building Products Inc.

• Beach Sheet Metal Co., Inc.

• Bear Creek Lumber

• Berger Brothers Company

• Betz Cut Stone Ltd.

• Buckingham-Virginia Slate Corp.

• Burlington Natstone

• C & H Roofing, Inc.

• 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.

• 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

• Gerard Roofing Technologies

• Globe Building Materials

• Granville Manufacturing Company, Inc.

• Greenstone Slate Company

• Harvey Building Products

• Hilltop Slate Inc.

• IKO

• Iko Industries Ltd.

• Ink Smith Inc.

• International Slate

• James Hardie Building Products, Inc.

• Loadmaster Systems

• MELLCO

• Maibec Industries, Inc.

• Malarkey Roofing Products

• Masonite International Corporation

• Masonite U.S. Holdings, Inc.

• Maxitile, Inc.

• Meeker Cedar Products Ltd.

• Met-Tile

• MetalWorks

• Mullane: M.J. Mullane Co.

• North Country Slate

• Overly Manufacturing Co., Inc.

• Owen Marble Shop, Inc.

• PABCO Roofing Products

• PTX Industries, Inc.

• Quarry Slate Company

• RGM Products

• RHEINZINK GmbH & Co. KG

• Re-Con Building Products, Inc.

• Re-Con Building Products, Inc.

• Revere Copper Products Inc.

• Rheinzink Canada Ltd.

• Roberts Roofing

• S&K Roofing, Siding and Windows

• Shakertown 1992, Inc.

• Siplast, Inc.

• Slate International, Inc.

• Structural Slate Company

• Tamark/Life Pine Mfg.

• Tamko Roofing Products

• Thermoflo Equipment Company, Inc.

• US Intec, a divison of BMCA

• Vande Hey-Raleigh Mfg., Inc.

• Vermont Slate & Copper Service

• Vermont Structural Slate Company, Inc.

• Vinyl Corp.

• WF Norman Corporation

• Wellington Polymer Technology Inc.

• Western Wood Products, Inc.

• Woodard Custom Painting

• Zaleski Snow-Guards

• Zappone Manufacturing