Internal Panelling

External Cladding


Western Hemlock Timber Species

Western Hemlock (Tsuga heterophylla)

Western Hemlock – a softwood that produces a beautiful pale timber with a uniform, attractive grain perfect for a wide range of commercial uses from pulp and construction to furniture and carving. The timber is used in construction but as a softwood is not durable and requires treatment for external use. Ideal for internal paneling. Light in weight and straight grain, workability has been compared to that of pine – it is resistant to splitting, holds nails and screws securely and saws easily without splintering. Attractive, delicate, dark grey or black streaks may be apparent in the wood. There is little variation in colour between the heartwood and sapwood, and they are often indistinguishable from one another.

Physical Properties

  • Dry Density: 500 kg/m³
  • Janka Dry Hardness: 2.6-3 kN

The Janka rating is the hardness level given to each species. The higher the number, the greater the hardness.


Species Name Western Hemlock
Botanical Name Tsuga heterophylla
Colour Range lustrous pale cream colour
Janka (Hardness) Rating – Dry 2.6-3
Natural Durability Class In-ground contact 4
Outside above ground contact 4
Density (kg/m3) Unseasoned (Green)
Seasoned (Dry) 350
Strength Group Unseasoned (Green) S6
Seasoned (Dry) SD6
Joint Group Unseasoned (Green) J4
Seasoned (Dry) JD4
Fire Indices Spread-of-Flame Index 9
Smoke-Developed Index 3
Critical Radiant Flux
Smoke Development Rate <250
Group Number 3
Naturally bushfire-resisting Timber unknown
Tangential Shrinkage % 5.0
Toughness (Nm) Naturally Unseasoned (Green) 15
Seasoned (Dried) 15
Naturally Termite Resistant to AS3660R = Resistant

NR = Non resistant

Naturally Lyctus SusceptibleS = Susceptible

NS = Non susceptible

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