Tatami: Japan’s Living Floor
Tatami mats — flooring modules made from a thick rice straw (igusa) base covered with woven rush grass and bound at the edges with cloth borders — have defined the aesthetic and sensory character of Japanese interior space for over a thousand years. The scent of fresh tatami, the slight give underfoot, the pale gold-to-green colour that darkens with age, and the geometry imposed by the mat’s fixed module (approximately 90 × 180 cm in most regions) are foundational to the experience of traditional Japanese rooms — from tea ceremony chambers and temple halls to farmhouse sleeping rooms and urban apartment tatami corners.
Construction and Materials
A traditional tatami has three components: the toko (base) — compressed rice straw approximately 5–6 cm thick, providing the mat’s characteristic resilience; the tatami-omote (surface) — woven rush grass (igusa) in a diagonal weave over a cotton warp, producing the characteristic textured surface; and the heri (border) — a woven cloth strip sewn along the two short edges. The rush grass (igusa) is grown primarily in Kumamoto Prefecture (particularly Yatsushiro and Hitoyoshi), which produces about 90% of Japan’s tatami rush supply. The rush is harvested in summer, dried, dyed (or left natural), and woven by specialist tatami weavers on dedicated looms. A single tatami requires approximately 4,000–5,000 rush stalks.
Tatami Room Conventions
Tatami rooms follow conventions that evolved over centuries of refinement. Room size is measured in tatami units (jo) — a 6-jo room (6 tatami) is a standard Japanese room; a 4.5-jo room is a tea ceremony space. Mat laying patterns vary by region (Kyoto-style and Tokyo-style layouts differ) and by occasion — certain auspicious arrangements are used for celebrations; specific inauspicious patterns (the funeral arrangement) are carefully avoided. Walking on tatami in shoes is considered disrespectful; shoes are removed at the entry to any tatami room. Furniture placed directly on tatami can cause permanent indentation — furniture feet should be protected with felt pads.
Tatami Craft and the Tatami-Ya
The tatami-ya (tatami craftsperson) is one of Japan’s traditional building crafts — the skill of measuring, cutting, and laying tatami to fit a specific room precisely, and of recovering worn mats with new igusa surfaces. The number of tatami-ya in Japan has declined sharply as Western-style flooring replaces tatami in new construction; the craft is concentrated in Kyoto, where traditional architecture preservation sustains demand. Some tatami studios in Kyoto and the Kumamoto igusa-growing region offer workshops in tatami-making basics — weaving a small mat section or assembling a coaster-scale demonstration piece. The Kumamoto Tatami Industry Association promotes agritourism around the igusa harvest in July.
Contemporary Tatami
Contemporary tatami production has adapted to changing construction realities. Thin tatami (approximately 1.5 cm, compared to traditional 5–6 cm) allows installation on wooden subfloors without recessing. Synthetic igusa (polypropylene rush) is used for durability and colour consistency in commercial installations. Ryokan, tea ceremony schools, and traditional house preservation projects maintain demand for full traditional tatami; the highest-quality new tatami installations for tea ceremony still use Kumamoto igusa and traditional rice-straw toko construction. The combination of natural material, traditional craft, and specific sensory quality ensures that full traditional tatami remains the benchmark even as alternatives proliferate.