Internal Panelling

External Cladding



Western Red Cedar Timber Species

Western Red Cedar (Thuja plicata)

Western Red Cedar is a large softwood that grows in British Columbia and some of the nearby western states of the USA. A versatile timber, it is commonly used for applications such as cladding, windows and joinery. Renowned for its natural beauty and durability. This exceptional wood has rich tones ranging from mellow ambers, to reddish cinnamons and sienna browns. Its texture is uniform and fine-grained, with a satin lustre. Western Red Cedar is an incredibly durable timber that’s perfect for the outdoors. The heartwood contains extractives (called Thujaplicans and Phenolics), that are toxic to decay-causing fungi. Its superior resistance to warping, cupping and twisting makes it ideal for use in cladding, panelling and screening

Physical Properties

  • Dry Density: 350 kg/m³
  • Janka Dry Hardness: 1.5 kN

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


Species Name Western Red Cedar
Botanical Name Thuja plicata
Colour Range pale brown/cream or honey colour to rich dark brown
Janka (Hardness) Rating – Dry 1.5
Natural Durability Class In-ground contact 3
Outside above ground contact 2
Density (kg/m3) Unseasoned (Green)
Seasoned (Dry) 350
Strength Group Unseasoned (Green) S7
Seasoned (Dry) SD8
Joint Group Unseasoned (Green)
Seasoned (Dry) JD6
Fire Indices Spread-of-Flame Index 10
Smoke-Developed Index 4
Critical Radiant Flux
Smoke Development Rate <250
Group Number 3
Naturally bushfire-resisting Timber Unknown
Tangential Shrinkage % 3.0
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

Part of the Modinex GroupDownload Modinex Brochure