COMPANY	DESCRIPTION
Architectural Testing Inc. 130 Derry Court York, PA 17402-9405 717-764-7700 717-764-4129 http://www.archtest.com e-mail: mmackerethmmackereth@archtest.com	ATI is a major player in the building envelope testing business. With seven laboratory locations in the USA and with links to the Pacific Rim and Middle East. ATI is positioned as a global player.
Construction Consulting Laboratory, International 1601 Luna Road Carrolton, TX 75006 971-463-1103 972-245-6047 http: e-mail: gblackburn@concon.biz	CCL, Int'l specializes in testing a building envelope. Field air and water, impact testing of glazing products, and special testing are available.
Raths, Raths & Johnson, Inc. 835 Midway Drive Willowbrook, IL 60527 Phone: 630-325-6160 Fax: 630-328-2866 http://www.rrj.com  e-mail: bjsmith@rrj.com	RRJ's window, door & curtain wall testing services include: air infiltration resistance, water penetration resistence, structural performance, component testing, diagnostic testing (troubleshooting), and leakage evaluation. Testing capabilities include standard ASTM and AAMA test methods, mock-up tests, and custom developed tests.

WDP & Associates, Inc.      8832 Rixlew Lane Manassas, VA 20109 Phone: 703-257-9280 Fax: 703-257-7589 http://www.wdpa.com e-mail: info@wdpa.com

WDP specializes in the evaluation of existing structures. We are nationally recognized experts in the evaluation. nondestructive testing and engineering of structural repairs and provide full-service engineering and testing for repair/restoration programs on a wide range of structures throughout the US.