NBS Source
List your products
Description

Siberian larch cladding, sourced from reputable sawmills processing larch logs from well-managed forests in Siberia and northern Russia. Siberian larch trees grow very slowly, and consequently the larch wood is extremely dense and strong when compared to other softwoods such as spruce and cedar. The high resin content found in Siberian larch makes it one of the most durable softwoods in the world. It is available in two grades; many profiles and can be installed both horizontally and vertically. Compliant with BS EN 14915 and BS 8605-1; CE marked.

General information
Specification data - Softwood weatherboards
Product Reference

Siberian Larch Profiled External Cladding

Grade

A

Trade description - Unsorted.

B

Trade description - Fourths or Saw falling.

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.

Width

70 mm

Profiled only.

95 mm

Profiled only.

145 mm

Profiled only.

Standard product features

Length:

Random lengths of 2–6 m.

Appearance:

The wood is a golden yellow colour with a strong grain pattern, similar to pine. Depending on the grade, the boards may include some, or many, dark black knots. As the boards weather the colour will change to a silver-grey.

Technical properties:

  • Moisture content: 16–18%.
  • Natural durability (to BS EN 350-2): Durable, Class 3.
  • Insect attack: Resistant.
  • Service life (to BS 8417): Occasionally wet: 30 years; frequently wet: 15 years.
  • Treatability class: Resistant.
  • Movement class: Large.
  • Resistance to impact: High.
  • Resistance to fixing: Medium.
  • Mean density (when dry): 570–650 kg/m³.
  • When to fix: Ideally autumn/ winter months.
  • Grading (Grade A): BS 1186-3: Class 2; BS EN 942: J30; CE: Grade A.
  • Grading (Grade B): Too knotty to be graded under any standard.
  • Working properties: Good workability, takes fixings satisfactorily.
  • Extractives: Contains resin rather than oil or tannin. The resin is fixed by kilning and does not tend to bleed. The resin is not reactive.
  • 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.

Product Options

Fixing:

  • Profiled: Face fixed with stainless steel ring shank nails. Secret fixing not recommended due to instability of material.
  • It is essential to create an expansion gap between boards of at least 2mm to allow for the instability of larch.

Similar products from Vastern Timber