The Interior Systems Contractors Association of Ontario (ISCA) was incorporated on September 1, 1971. Originally it was incorporated as The Drywall Association of Ontario. In 1980 it was renamed The Interior Systems Contractors Association of Ontario and now represents over
80 contractors and 30 suppliers/manufacturers throughout the province who employ over 10,000 members of the International Union of Painters and Allied Trades and the United Brotherhood of Carpenters and Joiners of America to perform work in, but not limited to the following areas:
- Drywall & Acoustic Installation
- Thermal Insulation
- Exterior Insulated Finishing Systems
- Asbestos Removal
- Drywall Taping & Plastering
- Fireproofing Applications
- Residential Steel Framing
- Mold Remediation
In 1984 ISCA was issued a Certificate of Accreditation by the Ontario Labour Relations Board. This gave ISCA the right to negotiate with the United Brotherhood of Carpenters & Joiners of America, Drywall Acoustic Lathing & Insulation Local 675 in the Residential Sector. In 1987 ISCA was issued a Certificate of Accreditation by the Ontario Labour Relations Board to negotiate with the International Union of Painters & Allied Trades District 46, Local 1891 the Residential Sector.
Other companies involved in the manufacture and/or supply of material for the drywall & acoustic sector of the construction industry may join ISCA as an Associate Member.