1. ABC Supply Co. Inc.
2. ATAS International Inc.
3. Atlas Roofing Corporation
4. BlueScope Steel Limited
5. Carlisle Companies Incorporated
6. Compagnie de Saint-Gobain S.A.
7. Cornerstone Building Brands
8. DECRA Roofing Systems Inc.
9. Duchesne et Fils lt?e
10. GAF Materials Corporation
11. IKO Industries Ltd.
12. Kingspan Group PLC
13. LafargeHolcim Ltd.
14. McElroy Metal Inc.
15. Metal Sales Manufacturing Corporation
16. Nucor Building Systems
17. OmniMax International Inc.
18. Owens Corning
19. Safal Group
20. Sika AG
21. Standard Industries
22. TAMKO Building Products LLC
23. Tata Steel Ltd.
24. Zammit Metal Roofing