Home > Companies > Vastern Timber > Brimstone Ash Modified Profiled Timber Cladding

Thermally modified British ash cladding, produced from ash logs sourced from native woodlands. Brimstone ash is relatively knot free and even in colour, offering a clean appearance. Brimstone ash is available in many profiles and can be installed both horizontally or vertically. Thermal modification results in superior levels of stability and durability. Compliant with BS EN 14915 and BS 8605-1; CE marked. Grown in Great Britain. GIB independently certified.

Standard product features

Length:

Random lengths 1.8-3.0 m, allowing a small percentage down to 1.5 m. Lengths of over 3.0 m may be included but are not guaranteed.

Appearance:

Consistent dark chocolate brown colouring with a clearly defined grain pattern. The colour is further enhanced by the application of a clear oil such as Osmo UV-resistant oil. Brimstone ash weathers to a silver/ grey colour more quickly than non-modified timber. Boards are relatively knot and defect free.

Technical properties:

  • Moisture content: 4 - 6%.
  • Natural durability (to BS EN 350-2): Durable, Class 1.
  • Insect attack: Thermally modified wood is resistant to insect attack when used above ground contact.
  • Service life (to BS 8417): Occasionally wet: 60 years; frequently wet: 30 years.
  • Treatability class: Resistant.
  • Movement class: Small.
  • Resistance to impact: Medium to high.
  • Resistance to fixing: High, modified wood is brittle and should be treated with care.
  • Mean density (when dry): 330–390 kg/m³.
  • When to fix: No restrictions.
  • Grading: BS 1186-3: Class 1; BS EN 942: J20; CE: Grade A.
  • Working properties: Thermally modified woods are more brittle than untreated wood. Care should be taken when cutting and nailing to prevent chipping and break-out; pre-drilling is advised.
  • Extractives: The modification process involves no chemicals, and any natural chemicals in the wood are removed during the process. Thermally modified wood can be treated as inert.
  • 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.

Options

Fixing:

Face fix or secret fix using stainless steel ring shank nails (dependent on profile) or second fix gun stainless steel brad nails.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-95/360 Timber lining boards
45-45-95/332 Modified wood weather boards

Product specification

An important note about specifying

Manufacturer

Name:

Vastern Timber

Tel:

+44 (0)1793 853281

Product reference

Brimstone Ash Modified Profiled Timber Cladding

Profile

[Halflap, VHL1]
-
Machined; 20 mm depth, vertical.
[Halflap, VHL2]
-
Machined; 20 mm depth, vertical.
[Halflap, VHL3]
-
Machined; 20 mm depth, vertical.
[Halflap, VHL4]
-
Machined; 20 mm depth, vertical.
[Halflap, VHL5]
-
Machined; 20 mm depth, horizontal.
[Halflap, VHL6]
-
Machined; 20 mm depth, horizontal.
[Halflap, VHL7]
-
Machined; 20 mm depth, horizontal.
[Shiplap, VSL1]
-
Machined; 20 mm depth, horizontal.
[Shiplap, VSL2]
-
Machined; 20 mm depth, horizontal.
[Shiplap, VSL3]
-
Machined; 20 mm depth, horizontal.
[Splayed, VSP1]
-
Machined; 20 mm depth, horizontal.
[TG&V, VTG1]
-
Machined; 20 mm depth, vertical or horizontal.
[TG&V, VTG2]
-
Machined; 20 mm depth, vertical or horizontal.
[TG&V, VTG3]
-
Machined; 20 mm depth, vertical or horizontal.
[TG&V, VTG4A]
-
Machined; 20 mm depth, horizontal.
[TG&V, VTG5A]
-
Machined; 20 mm depth, horizontal.
[TG&V, VTG6]
-
Machined; 20 mm depth, vertical.

Width

[70 mm]
[95 mm]
[120 mm]
[145 mm]

Manufacturer details

The Sawmills,
Vastern Wharf,
Wootton Bassett,
Swindon,
Wiltshire, SN4 7PD
Tel +44 (0)1793 853281
NBS Plus
NBS National BIM Library