The United States will impose tariffs on certain Canadian timber imports after its commercial commission discovers that the US industry was "materially harmed" by the goods.
The 4-0 decision comes after the US Department of Commerce. UU It will not reach an agreement in the long commercial dispute last month.
Tariffs affect Canadian imports of softwood with a value of almost $ 5.7bn (C $ 7.3bn; £ 4,200bn) in 2016.
Canada appealed to international panels in the dispute.
It is challenging the findings in the World Trade Organization and via the dispute mechanism of the North American Free Trade Agreement (NAFTA).
The rates, outlined by the Department of Commerce in November, would add tariffs ranging from 10-24%, depending on the company, which is lower than a previous proposal.
Canada said that tariffs were determined using a flawed methodology.
The ruling comes amid an increasing number of commercial disputes between the United States. UU and Canada and will probably complicate the already tense negotiations over Nafta.
Susan Yurkovich, president of the BC Lumber Commercial Council in Canada, called the ruling "completely without merit."
"ITC's finding of injury", despite the current record profitability of the US timber industry, makes it very clear that this was not an objective assessment of the facts, "he said.
The United States adopted heavy tariffs on the importation of soft Canadian lumber, a common building material used in housing construction, in April.
But this summer, the Commerce Department said it would postpone a final decision on the investigation with hopes of reaching a "negotiated solution."
In November, the department said the talks had failed. He said his research determined that Canadian softwood was being unfairly subsidized and sold in the US. UU Below the cost and described the tariffs.
The next step was the decision of the International Trade Commission on whether US producers were harmed.
group for the American timber industry, one of the organizations seeking an investigation, welcomed the decision of the International Trade Commission.
"Now, with equal conditions, the US lumber industry and the 350,000 working men and women who support it, can have the opportunity to compete fairly," said Jason Brochu, co-chair of the US Lumber Coalition.