• Westlake Royal Building Products

  Westlake Royal Building Products is a leader throughout North America in the innovation, design, and production of a broad and diverse range of exterior and interior building products, including Siding and Accessories, Trim and Mouldings, Roofing, Stone, Windows and Outdoor Living.

• Westlake Royal Building Products

• A-Solution, Inc.

• ABP Sign Company, Inc.

• Academy Fence Company

• Acadia Windows & Doors

• Acorn Wire & Iron Works, Inc.

• Acoustic Systems

• Action Store Fronts Inc.

• Activar Construction Products

• Advance Concrete Form, Inc.

• Airtec Corp.

• All Weather Products

• Allegheny Millwork & Lumber Co.

• Allied Window

• Aluflam North America LLC

• American Acrylic Corp.

• American Woven Wire Corporation

• Andersen Windows

• Arm-R-Lite Door Mfg. Co.

• Armortex

• Artistic Doors and Windows, Inc.

• Bayform Div. Of Bay Mills Ltd.

• Bayside Designs

• Benra Associates

• Big D Metalworks of Texas