Basic Knowledge of Tatami

• Tatami Structure

• Tatami Core (Tatami-doko)

• The core is the central part of a tatami mat, usually unseen but playing the most critical role in its performance. The tatami core offers optimal firmness, flexibility, excellent soundproofing, insulation, and humidity control. Particularly, 100% rice straw cores have shock-absorbing properties, making them ideal for households with seniors or young children. Unlike flooring or carpets, they provide a soft surface that offers peace of mind.

• Tatami Cover (Tatami-omote)

• The tatami cover is woven from "igusa" (soft rush grass). This grass is cultivated over a year by farmers and then woven by producers and tatami craftsmen. High-quality tatami covers are characterized by long, evenly thick, and uniformly colored rush blades. Even within a single farm, the rush grass can be categorized into premium or standard grades based on its condition.

• Tatami Edging (Tatami-fuchi)

• Tatami edging, made of fabric or polyester, protects and reinforces the edges of the tatami cover. Properly sewn edges prevent deformation and fraying. Historically, the edging represented authority and social status, using materials like silk, hemp, and cotton. Today, polyester and other materials are also used, offering a wide variety of colors and patterns.

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• Care and Maintenance

• Vacuuming
  When vacuuming, move along the weave of the tatami cover, paying particular attention to the edges.

• Ventilation
  On sunny days, ensure good airflow by thoroughly ventilating the room.

• Wiping
  Dry wiping is the basic cleaning method for tatami. Avoid excessive moisture.

• Mold Prevention
  If mold occurs, brush along the weave of the tatami cover, vacuum the mold, and wipe it off with disinfectant alcohol while wearing gloves. Dry thoroughly afterward.

• Dust Mites Prevention
  To prevent dust mites, maintain good ventilation and clean frequently. If possible, airing out the tatami is the most effective measure.

• Tatami Cover Residue
  If the tatami cover leaves residue on clothing or dents and gaps become noticeable, it may be time to replace the tatami.

• Regular Tatami Refreshing

• Flipping
  Three to four years after installing new tatami, if it becomes sun-damaged or shows wear, flipping and reusing the tatami cover is recommended. However, this may not be possible if the tatami cover is too worn.

• Cover Replacement
  Replacing the tatami cover with a new one is usually done every four to five years.

• Full Replacement
  Replacing the entire tatami mat is performed when needed. While the tatami core can last 10–20 years with proper use, it’s essential to monitor humidity levels under the floor and ensure adequate ventilation.

• Functions and Benefits of Tatami

• Humidity Regulation
  Tatami naturally regulates humidity, providing a cool environment in summer and a warm one in winter.

• Air Purification
  It absorbs harmful substances like formaldehyde and nitrogen dioxide, helping to maintain clean indoor air.

• Aroma
  The scent of tatami is known as "natural aromatherapy," soothing the mind.

• Flexibility
  Its moderate elasticity reduces the risk of injury during falls.

• Soundproofing
  Tatami not only cushions impacts but also absorbs daily noise and vibrations.

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