Close-up of charred black wood at a slight angle with text overlay describing 'Sumi' as deep charred with raw intensity, the purest expression of Yakisugi.

SUMI 炭

Deep charred. Raw intensity. The purest expression of Yakisugi.

SUMI refers to the purest and most traditional form of Yakisugi, characterized by a dark, jet-black finish created through the carbonization process of Japanese cedar wood. This ancient technique not only enhances the wood's aesthetic appeal with a naturally deep, rich tone but also increases its resistance to rot, insects, and fire. The SUMI finish brings out the subtle texture and grain of the wood while preserving its durability and longevity. It is a timeless choice for those seeking a harmonious blend of traditional craftsmanship and modern design.

Waiting area with two gray cushioned chairs, a white side table with a brown leather bag, and a black magazine holder, set against dark wooden wall panels and a black shelving unit with colorful books.
Close-up view of a dark wood-paneled wall with three light bulbs attached, illuminated and casting light on the paneling, adjacent to a white wall and window.
A long exterior wall of a building with white upper part, black textured lower part, and a traditional Japanese roof with curved tiles.

  • Download Sumi Spec Sheet (PDF)

    Coating: 3X Polyurethane or custom.

    Finish: Charred - deep carbonization all four sides at 1700C+

    Moisture Content: Kiln-dried KD 12% (+/-2%)

    Species: Cryptomeria Japonica - native to Japan. Known as "Sugi" in Japanese.

    Origin: 100% Made in Japan

    Decay Resistance: +72% vs. untreated spruce/pine (VTT Finland Research)

    Moisture Absorption: 92% reduction vs. untreated wood (Kyoto University)

    Expected Lifespan: 80-100+ years with proper installation

  • 1 x 6 × 6

    1 x 6 × 9

    1 x 6 × 12

    Profiles: Shiplap, tongue and groove, and v-groove.

    • Each board is unique - slight variations in pattern and depth are natural and expected.

    • Handle with care during installation. Wear gloves and protect adjacent surfaces.

    • Suitable for both interior and exterior applications.

    • Fire resistance is enhanced - longer ignition delay and reduced flame spread vs. untreated wood.

    • Natural silver-gray patina develops over time when exposed to UV.

    • Minimal maintenance - no painting, staining, or chemical treatment needed.

    • For exterior use, install as rain screen with adequate ventilation gap.

    • Coat all field cuts and rips with touch-up oil or matching stain.

  • Complete installation manual available upon request.

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NAGURI ナグリ

"Naguri" is a traditional Japanese woodworking technique in which the surface of the wood is carved or hammered. This method is commonly found in the construction of traditional Japanese houses, temples, and shrines. The surface of the wood is intricately scratched by carving or hammering to create a distinctive texture. This technique has been used for furniture and building materials in various applications, and it continues to be appreciated today in contexts where its traditional beauty and durability are highly valued.

Not charred - carved. Traditional hand-adzing in 8 patterns.

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