In a decision expected to significantly reshape the U.S. building materials market, the U.S. International Trade Commission (USITC) voted on April 1, 2026, to approve safeguard measures on imports of Quartz Surface Products (QSP).
Section 201 Investigation Background
The case, Inv. No. TA-201-79, was launched in November 2025 following a petition from domestic producers. Unlike earlier trade actions targeting specific countries such as China, India, or Turkey, this investigation was conducted under Section 201, allowing for a global review of imports.
U.S. manufacturers argued that a sharp increase in imports — estimated at 73.4% between 2020 and 2024 — placed significant pressure on domestic producers, reducing profitability and contributing to weaker employment conditions in the sector.
Commission Finds Serious Injury
In a 2-1 vote, the Commission determined that increased imports have contributed to serious injury in the domestic industry.
The ruling allows the White House to consider emergency safeguard measures, which may include:
- Additional ad valorem tariffs
- Import quotas
- Tariff-rate quotas (TRQs)
Possible Exemptions Under Review
Although the investigation has a global scope, exemptions may apply under existing trade rules.
Key considerations include:
- USMCA partners (Canada and Mexico): Imports will be assessed to determine whether they contribute to domestic injury and may be excluded from measures.
- Developing economies: Countries with less than 3% market share may qualify for exemptions under WTO guidelines.
Industry Reaction Divided
The decision has triggered mixed reactions across the industry.
Domestic producers welcomed the ruling, saying it is necessary to restore fair competition, protect jobs, and encourage new investment in U.S. manufacturing.
Importers, contractors, and fabricators, however, warned that new trade barriers could significantly increase material costs. They also raised concerns about supply shortages and potential delays in major construction projects due to limited domestic production capacity.
Next Steps in the Process
The case now moves into the remedy phase.
- April 14, 2026: Public hearing on proposed safeguard measures
- May 18, 2026: USITC submits final report and recommendations to the President
- Summer 2026: Final decision expected from the White House
Analysts expect heightened volatility in the quartz surface market as companies adjust supply chains ahead of final policy implementation.
Quartz Case Separate From Previous Tariff Regime
Officials emphasized that this case applies exclusively to artificial quartz surface products and is unrelated to the earlier tariff regime that was recently annulled by the U.S. Supreme Court.
Natural stone products are not included in the current USITC investigation and remain unaffected by the proposed measures. As a result, they continue to operate under the post-ruling framework established by the court’s decision, offering a more stable alternative for importers amid uncertainty in the quartz segment.
