Japan · Textile / Structural Craft

Tatami Mat Making (Tatami-shi)

畳 (Tatami)

Tatami (畳) mat making is the craft of producing Japan's traditional floor covering — a composite structure of rice straw base (床 toko), woven rush surface (ゴザ goza — from igusa rush, Juncus effusus), and decorative border tape (縁 heri). The surface is woven in a specific herringbone pattern from igusa rush — but the critical craft knowledge is in the base (toko) compression and the surface tension: the rice straw base must be compressed to precisely calibrated density that produces the characteristic firm-yet-yielding feel when walked upon, and the rush surface must be stretched to exactly the right tension before stitching to the base — too tight: surface wrinkles when compressed by foot; too loose: surface sags and igusa rushes separate. A master tatami-shi calibrates toko density and surface tension by foot pressure — walking on the assembled mat before final stitching.

Risk level: Endangered · Not separately inscribed; recognized within Japanese traditional housing heritage

Alternate Names
Tatami; igusa rush mat; tatami-shi
Geographic Center
Nationwide — concentrated in Hiroshima, Fukuoka, Okayama (igusa cultivation centers)
Community / Ethnic Group
Japanese; tatami-shi (畳師) artisan community
Estimated Origin
Nara period (710–794 CE) single reed mat; composite tatami form established Heian period; standardized room-covering use from Muromachi period
Cultural Function
Japanese interior floor covering — defines room quality; tea ceremony room specific tatami configuration (4.5 tatami standard); Noh theater stage floor material; formal Japanese room element
Primary Materials
Igusa rush (灯心草 Juncus effusus) for woven surface; rice straw (稲藁 inawara) for toko base; cotton or silk border tape (heri) for edge
Primary Tools
Tatami stitching needle (tatami-bari — large, curved); palm thimble (掌当て temobuke); hydraulic press for toko compression; surface stretching frame
Process Overview
Toko base compression → foot pressure density test → goza surface preparation → goza stretching on frame → goza attachment to toko → heri border attachment → room measurement and fit
Traditional Applications
Japanese interior floor covering; tea ceremony room; Noh stage floor
Contemporary Applications
Traditional Japanese interior; tea ceremony revival; cultural heritage preservation
Notable Practitioners
Tatami-shi workshops throughout Japan — approximately 5,000 remaining (declining); Kumamoto Igusa Agricultural Co-operative; no specific Living National Treasure designation
Key References
Engel, H. (1964). The Japanese House. Tuttle; Japan Tatami Industry Association publications; Kumamoto Prefecture igusa documentation
Verification Status
Verified

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