Wood in Japan: Tradition, Technique and Application

geschreven door Hera Van Sande | 18 May 2026

Japan is a country with rich forest cover; about 67% of its land area consists of forests. This high percentage is due to the mountainous landscape and the temperate to subtropical climate, which is favorable for the growth of various tree species. Over the centuries, wood has played a central role in Japanese culture, architecture, and crafts. In contrast to the West, where stone became the dominant building material, Japan remained strongly dependent on wood. This is partly due to its abundant availability, but also because of the many advantages of wood in an earthquake-prone area. After all, Japan is located in one of the most seismically active regions in the world. This has led to a building tradition in which flexibility and shock resistance are central. Wooden structures are flexible and can absorb vibrations without collapsing. Many temples and pagodas, such as the Horyu-ji pagoda (seventh century), have withstood earthquakes for centuries thanks to their clever construction. The central pillar of this pagoda, for example, acts as a shock absorber, a principle that even inspires modern seismic structures. 

Japanese carpenters have developed techniques over the centuries that require no nails or screws. This allows the wood to expand and contract freely depending on humidity; nails would weaken the structure. Moreover, wood joints make it possible to dismantle and reuse structures. Another reason is the light weight, compared with stone or concrete, which means the forces during an earthquake are less destructive. An additional advantage is found in the traditional modular building technique, consisting of replaceable and reusable parts, so that damaged sections can be repaired without demolishing the entire building. The aforementioned Horyu-ji pagoda is one of the oldest wooden buildings in the world.

Important wood species

Japan has an enormous diversity of wood species, but some are especially valued for construction and craftsmanship. Hinoki (Japanese cypress) is one of the most beloved wood species in Japan, especially for temples, shrines, and bathhouses. The wood is durable, rot-resistant, and gives off a pleasant citrus-like scent that lasts for centuries. This wood is also used for iconic buildings such as the Ise Jingu shrine, which is rebuilt every 20 years according to ancient traditions. Sugi (Japanese cedar) is lighter and softer than hinoki, and therefore easy to work with. It is popular for house building, furniture, and sake barrels. This wood species is widely used in Shou Sugi Ban, a technique in which the wood is burned to increase durability. Keyaki (Japanese elm) is a very hard wood species with a beautiful grain pattern. It is used for furniture, temple gates, and portable shrines. Kiri (Paulownia) is a light wood species, resistant to moisture, ideal for chests, musical instruments, and kimono storage boxes. It has excellent fire-retardant properties, which made it popular for storage chests for samurai armor. These four wood species are particularly durable, but they also have aesthetic and spiritual value in Japanese culture.

The place where a tree grows affects the strength of the wood. Trees can grow in valleys, on slopes, or at high altitude around mountain peaks. Trees in valleys (Tanigi) grow in fertile, moist soil with little exposure to strong winds. The wood grows faster, is lighter, and less dense. The annual rings are spaced far apart because the tree receives more nutrients and water. This wood is less suitable for heavy construction because it is softer and less strong. It is often used for decorative woodwork, panels, and furniture. Trees on slopes (Sakagi) must adapt to an incline and often grow at an angle or with a slight curve. Due to the difficult growing conditions, the wood becomes denser and stronger. Wood grain can sometimes be asymmetrical, which plays a role in processing. The wood from these trees is often used for houses, shrines, and furniture where strength is required. Some curved trunks are specially selected for arch constructions or roof trusses. Trees at high altitude or on mountain peaks (Yamagi) grow slowly because of the cold, strong winds, and limited nutrients. The annual rings are close together, resulting in very strong and compact wood. The fibers are finer, and the wood is more resistant to rot and insects. This wood is ideal for temples, pagodas, and bridges because of its strength and durability. Hinoki and sugi from higher-altitude areas are traditionally used for the most prestigious buildings in Japan.

Techniques

The ingenious wood joint techniques are grouped into several categories. First, there is kanawa-tsugi, a complex joint used to connect beams seamlessly. Corner rafters, mortise-and-tenon joints, and dovetails are assembled without additional fasteners. Second, there is schachi-sen, a wooden wedge technique in which a peg or wedge is driven into hard wood, usually zelkova or oak, as a finishing piece in a complex joint for the final clamping of the pieces of wood to be joined. Third, there is kigumi, a decorative and structural technique in which wooden parts fit together without glue, similar to a three-dimensional puzzle. These techniques are still used today in temples and artisanal woodworking.

In Japan, woodworkers saw and plane toward themselves, instead of away from themselves as in the West. This requires a different posture and working method, but results in a finer and more precise finish. In sawing techniques, Japanese saws (such as the ryoba and the dozuki) have thinner blades and cut on the pull stroke, requiring less force and producing a more precise cut. In planing techniques (the Japanese plane kanna), the wood is pulled toward the worker, resulting in finer shavings and more control over the planing work.

Another fascinating technique is shou-sugi-ban, a technique in which wood is burned to make it more resistant to moisture and insects. These blackened façades still often characterize rural architecture.

Kiwari: The Japanese measurement system

Unlike Western building standards, which often use fixed dimensions, Japan uses a flexible measurement system, kiwari, based on the proportions of the wood itself. Kiwari ensures that wood is used optimally, without unnecessary waste. The sizing of wooden beams and planks is determined by the natural dimensions of the tree rather than by standard sizes. This system aligns with the Japanese philosophy of wabi-sabi, in which the natural imperfections of materials are appreciated. The system is closely connected to the principles of harmony and efficiency in Japanese architecture.

The width of a room was often determined by a ken (1 ken ≈ 1.82 m), related to the size of a tatami mat, but the exact proportions of wooden elements followed the kiwari system. So one worked with ratios rather than fixed measurements, allowing the dimensions of building components to remain in harmony regardless of the overall scale of the building.

The kiwari system was based on the column (hashira), with the diameter or width of the column serving as the base measure and determining the dimensions of other building components. The other elements, such as beams, roof structures, and doorposts, were proportionally derived from this base measure through fixed ratios. In contrast to Western units of measurement (such as centimeters or inches), the kiwari system adapted flexibly based on the design and function of a building. A commonly used rule was that the width of a beam, for example, is half or a third of the width of the column. Roof edges and roof trusses also followed fixed ratios based on the size of the supporting columns. This system helped craftsmen create balanced and aesthetically sound buildings without complex calculations using fixed units. Although the metric system is used today, kiwari is still studied and applied in traditional Japanese woodworking. In tea houses, for example, designed by the famous tea master Sen no Rikyū, the kiwari system was used to create an intimate and harmonious atmosphere. The kiwari system therefore ensures that all elements in a building or structure are in perfect harmony with one another, contributing to the timeless beauty of Japanese architecture.

Imports today

Japan sources its wood both from native forests and through imports. Although Japan used to be self-sufficient in wood production, it is now heavily dependent on imported wood. Only 30 to 40% of national wood demand is met from domestic forests, both natural forests and plantations established after World War II. The rest is imported. Japan is one of the largest importers of wood in the world. It imports wood from countries such as Canada (spruce, pine, Douglas fir), the United States (oak, walnut), Russia (larch, birch), Southeast Asia (tropical hardwood, teak), and Scandinavia (pine, spruce). Japan mainly imports cheaper, machine-processed wood because domestic wood production is more expensive due to high labor costs. Many forests are located on steep mountain slopes that cover almost three-quarters of the entire country. They are hardly exploitable. A second reason is that the country cut too much of its own forest area, especially during World War II but well into the 1960s, which meant that the standing timber stock had to be rebuilt. Only 57% is natural forest. In the 1950s and 1960s, many forests were mass-planted with sugi and hinoki, but these are poorly managed. Therefore, the government is now focusing on sustainable forest management and the restoration of the timber industry, encouraging selective logging to make forests healthier, and also providing subsidies to stimulate the use of local wood in house building and public projects. Rules have been established requiring schools and government buildings to use Japanese wood. Furthermore, efforts are being made to import certified sustainable wood (FSC, PEFC) to reduce deforestation in other countries. Tropical wood imports are declining due to stricter regulations and rising prices.

Wood plays an essential role in Japan in architecture, craftsmanship, and tradition. Through clever techniques and respect for materials, Japan has developed a unique woodworking tradition that is not only functional, but also aesthetic and sustainable. This heritage remains a source of inspiration for craftsmen worldwide to this day. Japan has strict forest management rules and a deeply rooted respect for nature and sustainability. Shinrin-yoku, literally ‘forest bathing’, is a modern expression that reflects the traditional Japanese appreciation of forests, not only as a source of wood, but also as a place for mental and physical health.