Teak

Wood Type

Tectona grandis

Teak belongs to the genus Tectona in the family Lamiaceae, the mint family — a botanical placement that surprises most people. The genus contains only three species, all native to South and Southeast Asia, and only one of them matters to woodworking:

Teak: Tectona grandis

Teak is not a family name the way mahogany or cedar are. There is no meaningful group of "teak species" to sort through. There is teak, and there is everything else being sold as teak that isn't.

Teak is the gold standard for outdoor wood. Its natural oils, interlocked grain, and exceptional density make it the most durable tropical hardwood available for furniture, boat decking, and exterior construction. It is also one of the most complicated materials to source responsibly. Understanding what you are buying matters as much as understanding the wood itself.

Janka Hardness

Teak: 1,070 lbf

Moderately hard, similar to black walnut and African mahogany. The Janka number alone does not capture teak's outdoor performance, which comes not from surface hardness but from the combination of natural oils, silica content, and interlocked grain that make it uniquely resistant to the forces that degrade wood in exterior applications.

What is Janka hardness?

Color

Heartwood: Golden to medium brown when freshly cut, often with darker brown streaks. Deepens to a rich honey-brown with age and light exposure. Left unfinished outdoors, teak weathers to a uniform silver-gray patina — one of the most elegant natural weathering processes of any wood.

Sapwood: Pale whitish-yellow, narrow, and clearly distinct from the heartwood. The sapwood contains few of the natural oils that make teak durable and should be avoided in exterior applications.

Flexibility-Stability

Teak is one of the most dimensionally stable hardwoods in the world. It shrinks and swells minimally with moisture changes, holds its shape reliably across the full range of outdoor conditions, wet seasons, dry seasons, direct sun, salt spray and resists checking and cupping. This stability, combined with its natural oil content, is the primary reason it became the standard material for boat decking and outdoor furniture in climates far harsher than its native range. It does not steam-bend readily due to its density and oil content, and is typically used in applications that favor its stability over its flexibility.

Region

Native to South and Southeast Asia, primarily Myanmar (Burma), Thailand, Laos, and India, Teak where it grows in tropical dry forests with a pronounced seasonal dry period. It is not a rainforest species. Teak evolved with alternating wet and dry seasons, and it is that adaptation by producing a dense, oily wood capable of surviving extreme swings in moisture, that gives it its outdoor durability. Myanmar historically held the largest natural teak forests, and Burmese teak was considered the finest quality available for most of the 19th and 20th centuries.

Tree Size

Teak is a large tropical tree, typically reaching 100–130 feet in height with trunk diameters of 3–5 feet. It is deciduous, dropping its large leaves during the dry season — unusual among tropical hardwoods and a reflection of its adaptation to seasonal drought. In plantation settings it grows faster and with less density than old-growth forest material, reaching harvestable size in 40–80 years depending on conditions.

Grain

Straight to slightly wavy, with a coarse, uneven texture. The surface has a distinctive greasy or oily feel when freshly worked. The natural oils that make teak so durable are present throughout the wood and immediately apparent to the hand. Luster is low to medium. Figured teak, wavy or interlocked grain producing ribbon-like striping, it occurs in some pieces and is prized for furniture and decorative work, though it is less common than in mahogany.

Useability

Teak is workable with both hand and power tools, but its silica content dulls cutting edges significantly faster than most hardwoods, carbide tooling is strongly recommended. The natural oils that make it so durable also interfere with adhesion: gluing teak requires careful surface preparation, typically wiping with acetone or naphtha immediately before applying glue to remove surface oil. Finishes similarly need surface preparation to adhere reliably. It takes a fine finish when properly prepared and polishes to a smooth, warm surface. Primary applications are outdoor furniture, boat decking, exterior joinery, flooring, and any situation where long-term outdoor durability is the primary requirement.

The Outdoor Standard

The reason teak became the outdoor wood is simple: it survives conditions that destroy everything else. Salt water. Tropical sun. Freeze-thaw cycles in northern climates. Direct ground contact. Teak handles all of it with minimal maintenance and no chemical treatment. The British Royal Navy figured this out in the 18th century when they started building warships from Burmese teak and found that the hulls lasted significantly longer than oak.

The Silica Problem

Teak contains measurable amounts of silica, the mineral compound in sand and quartz, deposited in its cell walls as the tree grows. This silica is part of what makes teak so abrasion-resistant outdoors, but it comes at a cost in the shop: it dulls saw blades, router bits, and plane irons significantly faster than most other hardwoods. Woodworkers new to teak are often surprised by how quickly their edges go dull. Carbide tooling, frequent sharpening, and realistic expectations are the practical response.

Plantation Teak vs. Old-Growth

The vast majority of teak on the market today is plantation-grown, primarily from Indonesia, Costa Rica, Panama, and parts of Africa. Plantation teak is genuine Tectona grandis, but it grows faster in managed conditions and produces wood with wider growth rings, lower oil content, and meaningfully different working properties than old-growth forest material. The difference in durability between plantation and old-growth teak is real but often overstated in marketing. Well-grown plantation teak from a reputable source is a durable, beautiful material.

The Teak Smell

Teak has a smell. Cut into a fresh board and there is something warm, slightly sharp, and distinctly its own, somewhere between leather and pencil shavings with a medicinal edge. It comes from the same oils that make the wood durable and the same compounds that make it difficult to glue without preparation.

Tectona: Boats & Butts

The genus Tectona contains only three species: Tectona grandis (teak), Tectona hamiltoniana (Dahat teak, native to Myanmar), and Tectona philippinensis (Philippine teak, native to the Philippines). Only Tectona grandis has been commercially significant. Its placement in the family Lamiaceae, the mint and sage family is one of taxonomy's more counterintuitive facts, reflecting molecular evidence that overturned an older classification placing it in Verbenaceae. Teak's closest botanical relatives include sage, lavender, thyme, and basil. The aromatic oils that characterize many Lamiaceae members are present in teak as well, in more concentrated and woody form.
Natural teak forests are found across a broad band of South and Southeast Asia from India through Myanmar, Thailand, Laos, and into the Indonesian islands of Java and the Lesser Sundas. The species is adapted to tropical monsoon climates with a distinct dry season, typically growing in mixed deciduous forests on well-drained slopes between sea level and about 3,000 feet elevation. Myanmar holds the largest remaining natural teak forests, though logging pressure and land conversion have significantly reduced them over the past century. Plantation teak is now grown across a much wider range, including tropical regions of Latin America, Africa, and the Pacific.
Teak's commercial importance has been driven almost entirely by its outdoor durability. For centuries it was the premier material for tropical shipbuilding, both the indigenous boat-building traditions of South and Southeast Asia and the European colonial navies that extracted it. In the 20th century, teak became the standard for yacht and boat decking, outdoor furniture, and high-end exterior joinery globally. It is used in flooring, both interior and exterior, and in architectural applications where dimensional stability under varied conditions is critical. The teak trade remains economically significant in Southeast Asia and in the growing plantation industries of the tropics, though it is subject to increasing regulation and certification requirements as wild-harvested supply has declined.
Natural teak forests are part of complex tropical deciduous forest ecosystems that support significant biodiversity. Teak's large leaves fall during the dry season and decompose rapidly, contributing to nutrient cycling in what are often relatively nutrient-poor soils. Teak flowers attract a range of pollinators, and the tree's seeds are an important food source for birds and small mammals. The conversion of natural teak forest to plantation monoculture has reduced biodiversity significantly in affected regions, as the complex understory and associated species of mixed deciduous forest cannot persist in managed teak plantations. Certification schemes that require maintaining forest corridors and buffer zones represent an attempt to mitigate these impacts.
Teak has been a material of cultural importance across South and Southeast Asia for millennia. In Myanmar, Thailand, and India, teak was used for temple construction, royal palaces, and sacred objects, its durability and workability making it the prestige timber of the region's most significant buildings. The Grand Palace in Bangkok, much of the historic architecture of Mandalay, and countless temples and monasteries across the region were built substantially from teak. In Indian tradition, teak is associated with prosperity and longevity, and teak furniture remains a significant marker of household status across South Asia. The colonial extraction of teak forests is a live political and cultural memory in Myanmar and other affected countries. The forests were not simply a natural resource; they were landscapes that communities had lived within and depended on for centuries before they were treated as a commodity.