Heartwood and Sapwood in Plantation Teak: How to Read a Board

If you've called me about my Ecuadorian teak lumber or stood at the racks with me, you've probably asked how much of a board is heartwood. It's one of the most common things buyers ask me to explain. So here is the full answer, in plain language, from someone who buys this wood at origin and answers his own phone.

Heartwood and sapwood, in plain terms

Cut through any tree trunk and you'll see two zones. The outer band, just under the bark, is sapwood — the living, working part of the tree that moves water up to the crown. In teak, sapwood is pale: straw-colored, sometimes nearly white. The inner core is heartwood. As the tree grows, the older interior wood retires from that plumbing job and the tree deposits extractives into it — in teak, that means the natural oils and resins the species is famous for. Those extractives are what give teak heartwood its color: the deep, even, golden brown that people picture when they hear the word teak.

Same tree, same species, two very different materials. And the difference is not subtle. Set a heartwood board next to a sapwood-heavy one and anyone in your shop will spot it from across the room.

Why heartwood matters more in plantation teak

The old-growth Burmese timber that built teak's reputation came from enormous trees that were nearly all heartwood by the time they were milled. Plantation teak — which is what the teak trade overwhelmingly runs on today, including everything I import from Ecuador — comes from managed trees, and managed trees carry a wider band of sapwood relative to their diameter.

That means the honest question when you're buying plantation teak is not "is this teak?" It's "how much of this board is heartwood?" Two boards of the same species and the same dimensions can look and behave very differently depending on that ratio, and plenty of sellers would rather you didn't ask the question at all.

What to expect on a plantation board

Nobody selling plantation teak honestly can tell you every board is one hundred percent heartwood edge to edge. Expect to find boards whose show faces are golden-brown heartwood, and boards that carry a stripe of lighter sapwood along an edge or on a back face. Sapwood on an edge is workable: you can rip it away, turn it to a hidden face, or use the contrast deliberately if that's your style. Which boards suit your job is something you decide with the board in your hands, not something to take on a seller's word.

Why it matters in your shop

Color consistency comes first. When you build a face frame, a glued-up panel, or a run of drawer fronts, heartwood keeps a family of parts looking like one material. Sapwood is markedly lighter, and it takes stain and oil differently in your shop, so a sapwood streak in the middle of a glued panel announces itself forever.

Working properties come second. The same oils that color the heartwood also change how it behaves. Heartwood machines cleanly and burnishes to that smooth, almost waxy surface teak is known for. For glue-ups, those oils mean you should wipe joint surfaces with a solvent right before spreading adhesive — standard practice with teak, and cheap insurance on any board.

How to check for yourself

You don't need a lab. Look at the face: heartwood is golden to medium brown, sapwood is pale straw. Look at the end grain: on a board carrying sapwood, you'll see the color boundary run the length of the piece. Look at both faces, not just the show face on top of the stack. When you visit my warehouse, I'll flip boards with you — pull what you like, leave what you don't. I would rather you inspect the stack and buy only the boards you trust than take my word for anything.

How I sell it

I import Ecuadorian plantation teak directly, container-lot, and I sell it out of my Chicago warehouse. I don't ask you to buy on a description: you look at both faces, pull the boards you want, and the tally at loading is what you pay for. Because I'm the importer and not a middleman, I know exactly what came out of the container, and I'm the same person who describes it to you and hands it to you at will-call.

If you run a cabinet or millwork shop, I've put together a page on how I work with millwork and cabinet shops — tally-based buying, will-call pickup, and what to bring for tax-exempt resale purchases. Or just call me and ask how much heartwood is on the board. I'm Norman Jimenez, and I answer my own phone: (773) 584-7334, or info@platinumluxuryteak.com. I'll tell you straight.