Cedar Cladding


Cedar has become one of the best-known timber species for cladding in the UK.

However, few people know that the Cedar Tree used in cladding (Thuja plicata) grows in many different regions of the world. This means each will have its own characteristics due to the local climate and soil: colour, density, knot content, durability, etc.

  • Canadian Western Red Cedar:

The largest of the Cedars, CWRC trees can grow up to 75m high! 

Darker, more colour variation, less knots, denser, durable.

Fun Fact: did you know there's also White Cedar from Canada?

  • UK grown Cedar:

Lighter colour (cream), more knots, less dense, moderately durable but much cheaper.


Canadian Cedar
Canadian Western Red Cedar

Ecochoice delivers both Canadian and British Cedar cladding in a range of profiles such as shiplap, tongue-and-groove, TGV and many others directly to your project's site. 

The cladding boards can also be delivered pre-stained or fire-treated to Euro class B (class 0) if necessary.

Standard sizes tend to be 19x90, 19x115, 19x140 and even 19x190mm!

Canadian Western Red Cedar
British Cedar
British Western Red Cedar
British Western Red Cedar in London
British WRC at London development
Trade Name Canadian western red cedar
Species Thuja Plicata
Intended use External cladding
Appearance Canadian western red cedar has a strong, distinctive grain. The colours vary widely from dark chocolate brown to light pink.
Weathering If left untreated, cedar will naturally weather to a silver grey colour although the process can be inconsistent depending on shade, ventilation, moisture and pollution.
Profiles See our standard profiles page
Lengths Random 1.8 – 3.7mt +
Moisture content 16 – 25%
Natural durability (EN350-2) Durable Class 2
Insect attack Resistant
Desired service life:(BS8417) Occasionally wet 60 yrs
  Frequently wet 30 yrs
Treatability class Extremely difficult, Difficult (Sapwood)
Moisture Movement Small
Resistance to impact Low
Resistance to fixing Low
Mean density 330 – 390 kg/M3
When to fix No restrictions

BS1186-3 1990 Class 2. EN942:2007. J20. CE grade A. Clean with a few sound knots.

(Commonly sold with the trade grade description No2 Clear & better, allowing 15% 4ths)

Working properties

Good workability. Takes fixings satisfactorily. CWRC is soft and relatively brittle which can result in bruising and splintering.

Pre-drilling recommended near board edges - see our TDCA guides.


Western red cedar contains reactive oils, which will corrode ferrous metals.

When the two come into contact, a blue sludge is formed that will stain the wood and anything else it meets.

All fixings used in conjunction with western red cedar should be stainless steel.

The oil is brown in colour and could also leave unsightly brown stains on the surface of the cladding and

will stain any porous materials below the cladding. The reactivity of the oil makes western red cedar cladding unsuitable for polluted areas and shaded areas.

Emission of formaldehyde (EN14915) E1 (Not significant)
Reaction to fire (EN14915) Euroclass F (Untested). D-s2, d0
Fire treatment Possible by impregnation
CE compliant Yes

We took care compiling this info, however Ecochoice Ltd will not be held responsible for any consequences arising

from any errors or omissions on this website nor for any damages resulting from the use of the information.