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Tatami

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Tatami are traditional Japanese mats used for flooring. They are essential components of a washitsu, or Japanese-style room. These mats serve many purposes beyond simple flooring. Martial artists use them for training in a dojo. They are also used for tameshigiri, which is the art of target test cutting.

Enkō-ji, Kyoto Inside
Enkō-ji, Kyoto Inside

The mats are typically twice as long as they are wide. This rectangular shape defines the structure of many traditional Japanese living spaces.

Making a tatami mat requires a specific layered construction. The core, or center, is the foundation of the mat. Traditionally, this core consists of rice straw that has been sewn together. Modern versions may use compressed wood chip boards or extruded polystyrene foam.

Enkō-ji, Kyoto Inside
Enkō-ji, Kyoto Inside

Above the core sits a weft-faced weave made of rush. This weave is supported by a warp of hemp or cotton. There are usually four warps per weft shed. To reduce costs, some makers use only two warps per shed. The long sides are often finished with brocade or plain cloth edges.

Tatami sizes vary depending on their specific place of origin. Kyoto tatami measure approximately 1.82 by 0.91 meters. Nagoya tatami, also called chukyo, are 1.91 by 0.95 meters. Tokyo tatami, or edo, are 1.76 by 0.88 meters.

Enkō-ji, Kyoto Inside
Enkō-ji, Kyoto Inside

There is also a square format from the Ryūkyū Islands. These square mats do not have borders. Modern designs often use this borderless style for its simplicity. These regional differences exist because traditional Japanese length units varied by location.

In traditional measurements, a tatami is 1 by 0.5 ken. This is also equal to 6 by 3 shaku. One shaku is roughly the same length as one foot. Thickness also varies by type. An edomono mat averages 5 to 6 centimeters thick. A kyomono mat is usually 5 to 6 centimeters thick.

Enkō-ji, Kyoto Inside
Enkō-ji, Kyoto Inside

People often use partial mats as well. A half mat is called a han-tatami. A three-quarter mat is called a jo-tatami, often used in tea rooms.

The history of tatami shows a shift from luxury to common use. The name comes from a verb meaning "to fold" or "to pile." This suggests early mats were thin enough to stack. During the Heian period, nobles used mats only for seating. Floors in aristocratic shinden-zukuri residences were mostly wood.

Enkō-ji, Kyoto Inside
Enkō-ji, Kyoto Inside

In the Kamakura period, the shoin-zukuri style emerged for samurai and priests. By the Muromachi period, mats began covering entire rooms. Commoners did not have access to tatami until the late 17th century.

Layout rules are very important for the meaning of a room. In the Edo period, arrangements changed based on the occasion. An auspicious layout is the most common modern practice. In this pattern, the junctions of the mats form a "T" shape.

Enkō-ji, Kyoto Inside
Enkō-ji, Kyoto Inside

An inauspicious layout creates a grid where junctions form a "+" shape. This pattern was used for funerals to avoid bad luck. Today, most people avoid the "+" pattern because it is associated with misfortune.

Measuring space in Japan often involves the size of the mats. A common unit of area is the tsubo. One tsubo is the area of two tatami mats forming a square. This is formally 1 by 1 ken, or about 3.3 square meters.

Enkō-ji, Kyoto Inside
Enkō-ji, Kyoto Inside

In the Nagoya region, common room sizes are measured in mats. A 4-mat room is about 7.6 square meters. An 8-mat room is about 15.2 square meters. These measurements help define the scale of Japanese architecture and interior design.

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