1. American Building Components
2. ArcelorMittal S.A.
3. ATAS International Inc.
4. Atlas Roofing Corporation
5. BEMO Systems GmbH
6. Berridge Manufacturing Company
7. BMI Group
8. Building Products of Canada Corp.
9. Carlisle Companies Incorporated
10. Fletcher Building Group
11. GAF Materials LLC
12. Herbert Malarkey Roofing Company
13. Holcim Ltd.
14. IKO Industries Ltd.
15. Isaiah Industries Inc.
16. Johns Manville by Berkshire Hathaway Company
17. Kingspan Group
18. Onduline Group SAS
19. Owens Corning
20. Saint-Gobain S.A.
21. Sika AG
22. Stay Dry Roofing
23. TAMKO Building Products LLC
24. Tata BlueScope Steel Limited
25. Wienerberger AG