Exposure-1 Rated OSB Sheathing from Canada
Oriented strand board rated Exposure-1 for limited water exposure during construction, sanded surface, typically 7/16-inch for sheathing. HTS 4410.12.0010 covers this sanded wood OSB bound with resins, suitable for siding and structural panels. Wax overlay provides temporary protection.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Document Exposure-1 rating with test data showing ≤10% thickness swell after water exposure
• Ensure resin type (PF or UF) declared for TSCA compliance
• Label panels clearly with grade stamps visible for customs inspection