British Western Red Cedar Profiled External Cladding

Length:

Random lengths: 1.8 - 3.7 m.

Appearance:

British western red cedar has a pink-to-amber colouring with frequent dark knots. The colouring is paler, but more consistent, compared to the Canadian cedar. When left untreated, the cedar will bleach to a silver colour.

Technical properties:

• Moisture content: 16–25%.

• Natural durability (to BS EN 350-2): Moderately durable, Class 3.

• Insect attack: Resistant.

• Service life (to BS 8417): Occasionally wet: 30 years; frequently wet: 15 years.

• Treatability class: Resistant.

• Movement class: Small.

• Resistance to impact: Low.

• Resistance to fixing: Low.

• Mean density (when dry): 330–390 kg/m³.

• When to fix: No restrictions.

• Grading: Too knotty to be graded under any standard.

• Working properties: Good workability, takes fixings satisfactorily.

• Extractives: 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 that it meets.

• Emission of formaldehyde (to BS EN 14915): E1 (not significant).

• Reaction to fire (to BS EN 14915): Euroclass F (untested), D-s2, d0.

• Fire treatment: Possible by impregnation.

Fixing:

• Feather-edge: Face fix with stainless steel ringshank nails.

• Profiled: Face fixed or secret fixing with stainless steel ringshank nails (dependent on profile).