Tufa Building Blocks
Tufa building blocks, sawn flat from lightweight volcanic tuff for porous building walls, are classified under tariff item 6802.29.00 as other worked monumental or building stone. Tufa is a natural stone covered by heading 68.02 when simply cut or sawn with a flat, even surface, and it is not slate, making it eligible for this subheading for other stone.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | 5% | — | 5% |
| 🇲🇽Mexico | 5% | — | 5% |
| 🇺🇸United States | 5% | — | 5% |
| 🇩🇪Germany | 5% | — | 5% |
| 🇯🇵Japan | 5% | — | 5% |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the tufa is granite or similar igneous rock and further worked
Other worked igneous stone falls under this subheading.
If the blocks are made of concrete or artificial stone
Artificial stone building blocks are classified in heading 6810.
If the tufa is in crude form or merely cut into blocks without a flat surface
Unworked or roughly split stone is classified in Chapter 25, not Chapter 68.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the tufa blocks are only sawn or cut, with no added surface treatments, to maintain classification under this item
• Document the volcanic origin and density of the tufa for CBSA verification
• If blocks are used in load-bearing structures, confirm they meet Canadian building codes, as CBSA may require additional documentation
Related Products under Tariff item 6802.29.00
Basalt Paver Slabs
Basalt paver slabs are dense basalt sawn flat for high-end paving in public monuments. They fall under this tariff item as other monumental or building stone, simply cut or sawn with a flat or even surface, and are not slate or goods of heading 68.01.
Cut Coquina Shellstone Blocks
Cut coquina shellstone blocks are a calcareous limestone formed from cemented seashells, sawn into blocks with flat faces for rustic walls and fireplaces. They fall under this tariff item as worked monumental or building stone, simply cut or sawn with a flat or even surface, and are not slate or goods of heading 68.01.
Cut Tufa Stone Slabs
Cut tufa stone slabs are a porous calcareous stone formed by mineral springs, sawn into flat slabs for garden walls and decorative landscaping. They are classified here as worked monumental or building stone, simply cut or sawn with a flat or even surface, and are not slate or goods of heading 68.01.
Dolomite Stair Treads
Dolomite stair treads are sawn with flat even surfaces for interior monumental staircases. They fall under this tariff item as other monumental or building stone, simply cut or sawn with a flat or even surface, and are not slate or goods of heading 68.01.
Flint Architectural Cladding
Flint architectural cladding panels are knapped flint sawn flat for historic building restoration. They fall under this tariff item as other monumental or building stone, simply cut or sawn with a flat or even surface, and are not slate or goods of heading 68.01.
Limestone Veneer Panels
Limestone veneer panels are thin limestone panels sawn with flat faces for interior wall veneer applications. They fall under this tariff item as other monumental or building stone, simply cut or sawn with a flat or even surface, and are not slate or goods of heading 68.01.