Karamatsu 椴松 — Japanese Larch Timber

When You Need a Highly Durable Softwood

Karamatsu (Larix kaempferi) is Japan's native larch, and it occupies a different position in the Japanese softwood spectrum from Sugi and Hinoki. Where those two species are revered for refinement, Karamatsu is valued for density. Grown in Japan's cold northern regions where slow growth produces a compact, resinous timber, it is measurably harder and more durable than most Japanese softwoods, and it shows.

The grain is straight and pronounced. The knots are integral to the species character. Karamatsu is knotty by nature, so we don't have a clear or near-clear grade. What exists is our Alpine grade: knotty, naturally stable, and free of the defects that would make a knot a liability. No loose knots, no barked knots, no insect damage, no rot, no end splits. This timber's knots are structural features, not weaknesses.

Oiled or left exposed, Karamatsu develops a rich patina over time. For exterior decking, cladding, and structural joinery where longevity and visual presence matter, it is the correct Japanese timber specification.

Karamatsu Grades — Know What You're Ordering

We supply Alpine grade exclusively. The rationale is that Karamatsu does not produce clear timber. The species is inherently knotty, and supplying a so-called 'clear' grade would mean selecting around its natural character rather than working with it. Alpine grade embraces what the timber is.

Karamatsu is available kiln-dried or green. Price on Application (POA)

Karamatsu vs Other Japanese Softwoods

When deciding between Japanese species, the key distinction is application. Karamatsu is the preferred choice when the primary requirement is durability and exterior performance. Sugi is preferred when visual refinement, clear grades, or charring (yakisugi) is required. Hinoki is ideal when aroma, moisture resistance, and fine workability are the priority.

For decking and exterior cladding in particular, Karamatsu's higher density and resin content make it the more durable specification. Its character strengthens outdoors rather than deteriorating.

Enquire About Karamatsu

Tell us your application and we'll advise the best Karamatsu options for you. We'll respond within two business days with availability, indicative pricing, and lead time.

Phone / WhatsApp

+81 80 5744 6446

Email

grahams@north21.co.nz