- Carlisle SynTec Systems
- Dow
- Duro-Last Inc.
- Firestone Building Products Company LLC
- GAF
- Godfrey Roofing Inc.
- Henry Company
- Icopal Ltd
- IKO Polymeric
- Johns Manville
- Kingspan Group
- Owens Corning
- pH plastics
- Sika AG
- Siplast