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Japanese Cedar (Sugi) 1 Inch Tongue & Groove
Japanese Cedar (Sugi) tongue-and-groove boards are the go-to for any project that needs a tight, clean surface and natural durability — indoors or out. The interlocking profile installs fast and stays beautiful for decades.
Reversible profile — two looks, one board
Each board is milled with a flush face on one side and a V-groove face on the other. Install flush for a modern, seamless wall; flip it for the classic V-groove shadow line.
Best for
- Sauna walls and ceilings (low resin, handles heat and humidity without off-gassing)
- Exterior siding and cladding (naturally rot- and insect-resistant, no treatment needed)
- Raised planter boxes and garden beds (safe for edible gardens, holds up to constant moisture)
- Interior feature walls, porch ceilings, and soffits
- Cabin and cottage interiors
Sugi's natural oils make it one of the most durable softwoods available — resistant to rot, moisture, and insects without any chemical treatment. Available in 1×4, 1×6, and 1×8 profiles, 6 to 12 feet.
Specs
| Species | Japanese Cedar (Sugi) |
| Grade | See our grading guide for what our grades mean. |
| Profile | Tongue & groove, reversible flush face / V-groove face |
| Nominal Sizes | 1x4, 1x6, 1x8 |
| Actual Size | Profile-milled — reveal varies by profile; confirm exact spec with our yard team. |
| Lengths Available | 1x4: 8, 12 ft · 1x6: 6, 8, 10, 12 ft · 1x8: 12 ft |
| Moisture Content | Kiln-dried (KD) |
| Origin | Sourced from Japan, stocked at our Surrey, BC yard |
Helpful resources: Grading guide · Coverage calculator
Buying from William's Cedar
Free pickup at our Surrey yard (4748 152 St). Inspect every board before you load — hand back anything you don't love, no questions, no fees. Need delivery across BC? Text 778-322-4587 for a freight quote. Speccing a sauna, siding project, or planter build? Book a free 15-minute consultation.