- AEP-SPAN
- American Hydrotech
- Berridge Manufacturing Co.
- Certainteed
- Dow Chemical Co.
- Fabral
- Firestone Building Products
- GAF Materials Corporation
- Genflex Roofing Systems
- Hunter Insulation
- Insulated Building Systems, Inc.
- Integris Metals
- Karnak Corporation
- Koppers Industries, Inc.
- Laurenco Inc.
- Merchant & Evans, Inc.
- Monsey Bakor
- Performance Roof Systems
- Pittsburgh Corning Corporation
- Republic Powered Metals, Inc.
- Sarnafil, Inc.
- Siplast, Inc.
- Steelox Roof Systems
- T. Clear Corporation
- Tamko
- US Intec, Inc.
- W. P. Hickman Systems, Inc.
- Zip Rib
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- ATAS International, Inc.
- Atlas Insulation
- Carlisle SynTec Inc.
- Carlisle Coatings and Waterproofing
- CETCO
- Duro-Last Inc.
- Follansbee Steel
- Garland Co. Inc.
- Henry Co.
- Johns Manville International
- J. P. Stevens
- Kemper Systems
- Liquid Plastics Inc.
- Mule Hide Products, Inc.
- Petersen Aluminum
- Polyglass
- Rheinzink
- Seaman Corporation
- Soprema, Inc.
- Stevens Roofing Systems
- Tremco, Inc.
- Versico Inc.
- VM Zinc
- W. R. Grace
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