SUMI 炭
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.
| Coating | 3X Polyurethane |
| 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 |
10mm x 135mm x 2940mm
10mm x 135mm x 3940mm
18mm x 165mm x 2940mm
18mm x 165mm x 3940mm
- 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.
Request a sample kit, get a custom quote, or book a consultation with our team.
From sourcing and cutting to charring and finishing, every step takes place in Japan.
Each plank is carefully charred using traditional Japanese techniques at over 1700C.
From bold exterior facades to elegant interior feature walls, our Yakisugi adapts to any vision.