Westlake Chemical Corporation Headquarters

2801 Post Oak Blvd.
Houston, TX 77056
Phone: (713) 960-9111

David Hansen - Media Relations    mediarelations@westlake.com
Steve Bender - Investor Relations    investorrelations@westlake.com 

Westech Building Products, Inc.

Mailing Address:
P.O. Box 567
Mt. Vernon, IN 47620
Phone: (812) 985-3628
Toll-free in North America: (888) 953-3623.

North American Pipe Corporation 

2801 Post Oak Blvd., Suite 600
Houston, TX 77056
Phone: (713) 840-7473
Toll Free: (800) 999-7473
Fax: (713) 552-0087