The Sheet Metal Workers and Roofers International Association Local 56 was established in 1966 and currently represents 140 workers on Cape Breton Island.
Union Executive
| Business Manager | Jack Wall |
| President | Gerald Phillippo |
| Vice President | Donald Phillipo |
| Recording Secretary | Dave Whitty |
| Warden | Gary Lahey |
| Union Trustees | Vaughn Ross Tom Ross Dave Seymour Jamie MacLeod |
| Health & Welfare & Pension Trustees for the Union | Jack Wall Dave Seymour Joe Wall |
| Health & Welfare & Pension Trustees for the Company | William (Bill) Barrington Carson Mugford |