Limestone Concrete Riprap from Canada
Large crushed limestone boulders (6-18 inches) used for erosion control in concrete structures and waterways. Classified in HTS 2517.10.00.20 as broken/crushed limestone for concrete aggregates or ballast. Chapter note (a) exclusions do not apply to this crude form.
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
• Include USACE riprap gradation certificates; secure heavy bulk shipments with proper dunnage; differentiate from armor stone which may require 6801 classification