UK Western Red Cedar – Thuja Plicata


UK Western Red Cedar was commercially introduced into the UK in the 1950’s. Although it is the same species as the imported Western Red Cedar, it is very different. The UK grown variety is much faster grown and has regular sometimes large knots up to 50mm and when machined is can sometimes be slightly fluffy especially around knots. Care should be taken if using for a cladding to order a cladding quality grade as there are lower grades available not suitable for this end use. The UK grown Western Red Cedar is also only rated as moderately durable so if being used externally you should take advice on the best way to protect your cladding from rot and insect attack. If left untreated, when exposed to rain and sunlight, it will go an attractive silver grey colour.

Tech Specs

Botanical Name : Thuja Plicata

Wood Type : Softwood

Origin : UK

Sustainability : From well managed forests, certification available on request

Durability : Moderately Durable Class 3 as per BS 8417

Stability:Reasonably stable with a low shrinkage factor but can be prone to some warping and twisting

Density : 390 kg/m3

Thermal Conductivity Rating (U Value) : 0.107 W/m2 K

Availability : Sawn, planed and profiled products in a wide range of thicknesses, widths and lengths

Commercially Available Grades in the UK : Air Dried Cladding Grade knots up to 50mm

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