Thermal Mass Concrete Blocks from Canada
Dense concrete blocks designed to store and release heat for passive solar buildings. Classified HTS 6810.11.00.70 as unreinforced artificial stone building blocks. High thermal capacity from specific aggregates.
Duty Rate — Canada → United States
13.2%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Certify aggregate types for thermal claims; R-value docs optional
• Ensure uniformity for LEED credits