On June 21, 2018, the Canada Border Services Agency (CBSA) initiated investigations regarding the alleged dumping of certain 54-inch gypsum board from the United States imported into Canada for use or consumption in the provinces of British Columbia, Alberta, Saskatchewan, and Manitoba, as well as the Yukon and Northwest Territories. The complainant alleges that the dumped goods have caused material retardation of the establishment of the domestic industry in Western Canada.

The CBSA will issue its preliminary determination regarding the alleged dumping on September 19, 2018.

In January 2017, the Canadian International Trade Tribunal found that the dumping of gypsum board, sheet or panel originating in or exported from the United States of America, imported into Canada for use or consumption in the provinces of British Columbia, Alberta, Saskatchewan, and Manitoba, as well as the Yukon and Northwest Territories has caused injury to the domestic industry. Duties between 94.6% and 324.1% have been imposed on the subject goods since the final determination.