Jointed Sweet Chestnut Profiled Hardwood External Cladding

Length:

• Supplied in 4.0 m jointed lengths, allowing for small percentage of cut-backs.

• In some cases special lengths can be offered. Jointed boards comprise individual sections from 300-1000 mm.

Appearance:

Newly machined boards will be a relatively consistent light straw colour; some pieces may include brown or yellow mineral colouring. Being jointed from shorter lengths, the colour variation will be more exaggerated and the zigzag joints will be noticeable. As the boards weather, the colour variation will even out and will change to a silver-grey patina.

Technical properties:

• Moisture content: 16–20%.

• Natural durability (to BS EN 350-2): Durable, Class 2.

• Insect attack: Sapwood is excluded from front face.

• Service life (to BS 8417): Occasionally wet: 60 years; frequently wet: 30 years.

• Treatability class: Resistant.

• Movement class: Small.

• Resistance to impact: Medium.

• Resistance to fixing: Medium, pre-drilling recommended.

• When to fix: Ideally autumn/ winter /early spring.

• Grading: BS 1186-3: Class 2; BS EN 942: J30; CE: Grade A.

• Working properties: Average workability, takes fixings satisfactorily.

• Extractives: Contains tannic acid, which will corrode ferrous metals. When the two come into contact, a blue sludge is formed that will stain the oak 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: Untested.

Fixing:

• Feather-edge: Face fixed with stainless steel ring shank nails.

• Profiled: Face fixed or secret nail fixed with stainless steel ring shank nails.