Tatami Internal Materials

Choosing the Right Core (Daiken) for Your Environment

1. Traditional Rice Straw (Wara)

Quarantine Note: Rice straw requires strict plant quarantine inspection. Currently importable to EU nations. For the USA, a specific license is required.
Rice Straw Layer Compressed Straw

Traditional tatami core made of 100% natural Japanese rice straw. It is highly compressed providing a heavy, solid feel and excellent humidity regulation.

Material100% Dried Japanese Rice Straw
Thickness55mm / 60mm
WeightStandard: 35kg / Large: 45kg
Durability30+ years
FeelingModerate hardness with a natural straw scent.

2. Wood Fiberboard with Foam

Export Ready: Safe for export to all countries. No quarantine license required for wood fiberboard.
Fiberboard Core Multi-layer structure

The modern standard in Japan. Wood fiber layered with styrofoam for weight reduction and insulation. Eco-friendly and extremely flat.

MaterialWood fiber + Styrofoam board
Thickness40, 45, 50, 55, 60mm
WeightStandard: 15kg / Large: 20kg
Durability20+ years.

3. All-Fiberboard (High Durability)

All-fiberboard cross section Solid fiberboard

A premium eco-product without styrofoam. Offers superior flatness and durability. Suitable for high-traffic areas.

Material100% Solid Wood Fiberboard
WeightStandard: 25kg / Large: 30kg
FeelingSolid feel. Includes a soft cushion sheet.

4. All-Foam Board (Zetron)

Zetron Material Lightweight core

The lightest material available. Made from high-compression foam called Zetron. Perfect for extreme humidity or portable use.

MaterialHigh-compression Foam (Zetron)
WeightStandard: 10kg / Large: 18kg
Official SiteSekisui Zetron Info
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