A sound teak wood slab purchase depends on verified species, legal provenance, stable drying, and an unambiguous specification—not on color alone. Teak (*Tectona grandis*) varies naturally in grain
Ask the supplier to identify each slab with a reference number that appears on photos, measurements, invoice documents, and the final packing list.
A teak slab purchase should start with identity and traceability: verify that the timber is *Tectona grandis*, ask where and when it was harvested or reclaimed, and retain documents that match the individual slab or shipment. Common trade names can describe unrelated species, while legal and sustainability claims require evidence rather than appearance.
For Thai teak, request the seller’s species declaration, country-of-harvest or reclamation statement, invoice trail, and permit records relevant to the route. CITES administers international trade controls through its appendices, and FSC chain-of-custody certification can support supply-chain verification when applicable. Neither document replaces visual matching: compare the invoice slab number, photographs, dimensions, and received piece. “Teak” alone is not a sufficient material specification.
Inspect a teak slab as a structural blank, not merely a decorative board. Review both faces, all edges, and the end grain for checks, splits, insect damage, embedded hardware, twist, cup, or bow. Confirm which flaws remain after flattening and calculate the usable finished size from the thinnest, most irregular area.
Use straightedges and photographs with a tape measure across length, widest and narrowest width, and thickness. A rough 50 mm slab may yield less than 45 mm after flattening, depending on cup and saw marks; record every measurement at least 300 mm from a damaged end. Ask for raking-light images and moisture-meter readings on both faces. The USDA Forest Products Laboratory Wood Handbook explains why wood movement follows moisture change, making acclimation and final machining sequencing important.
Write the slab specification before a deposit is paid. It should state rough and finished dimensions, measured moisture content, accepted defects, machining scope, finish expectations, packing method, Incoterms, insurance responsibility, and inspection timing. This converts a visually distinctive natural material into a defined deliverable that a mill, freight forwarder, and buyer can check consistently.
State the intended use, such as a dining tabletop, counter, bench, or wall feature, because support design and allowable defects differ. Record the meter type, reading locations, and reading date rather than accepting a general “kiln dried” claim. For cross-border orders, select the applicable Incoterms rule and name who arranges export packing, freight, insurance, and customs documents. If timber packaging is used, confirm treatment requirements under ISPM 15.
Target moisture content should match the service environment and the supplier’s documented drying process. Ask for multiple meter readings, meter species settings, and the measurement date. A slab can be dry at its surface yet retain a wetter core, so acclimate it before final flattening, joinery, or finishing.
Yes, a large crack can be acceptable when it is stable, outside the required finished area, and intentionally incorporated into the design. It is not automatically acceptable near a joint, mounting point, or unsupported span. Mark accepted checks on photographs and specify whether resin filling, bow ties, or trimming are included.
Use the slab’s finished dimensions, not its rough dimensions, to calculate yield. Deduct material needed to remove bark, checks, waney edges, cupping, and end defects, then reserve extra thickness for flattening. A supplier should disclose the narrowest width and thinnest point so comparable quotes describe equivalent usable material.
This resource provides general purchasing guidance. Timber legality, import requirements, certification status, structural suitability, and moisture targets should be confirmed for the specific slab, destination, and intended application.
