• IBP Glass Block Grid System

• IE; Blinds

• Innovative Building Products

• International Aluminum

• International Window Corp.

• J. G. Braun Co.

• J. Sussman, Inc.

• JELD-WEN, inc.

• Jasco Window Corp.

• Jem Products Co., Inc.

• Jones Paint & Glass, Inc.

• Jordan Panel Systems Corp.

• Joyce Mfg. Co.

• Kansas Aluminum Inc.

• Karey Kassl Corp

• Kasson & Keller, Inc.

• Laurence: C.R. Laurence Co.

• Lincoln Wood Products, Inc.

• Linford Brothers Glass Co.

• Litex

• Louisiana Pacific Corporation

• Lynbrook Glass & Architectural Metals Corp.

• Lynchburg Stained Glass

• Magnetite Corporation

• Major Industries, Inc.

• Manko Window Systems, Inc.