Siberian Larch Cladding2018-11-07T14:13:12+00:00


Larix decidua

Millworks Siberian Larch Cladding is sourced from old-growth, slow grown logs, plentiful in the vast forest region of Northern Europe. This cold, harsh climate gives Siberian Larch some fantastic natural attributes, making it a popular choice on many building projects.

  • £20 per m2 for sawn profiles

  • Grade: Grade A (Unsorted)
  • Grade: Grade B (Sawfalling)
  • Widths: 100mm, 125mm or 150mm
  • FSC certified
  • Density: 570-650kg / m³


Siberian Larch has colour tones from pale reddish-brown to golden brown. Once weathered the colour will be a subtle grey. Straight grained, with tight annual rings and relatively few knots, give an attractive contemporary look.


Siberian Larch is very dense at 590kg per m3. This characteristic makes it hard wearing, perfect for exposed elevations or high traffic areas. Suited to commercial projects, or residential alike.


Siberian Larch has a maintenance free service life, due to natural resin and extracts in the wood. The high density makes it one of the toughest and most durable softwoods available. Siberian Larch is BS EN 350-2 Class 3.


Siberian Larch is dimensionally stable due to controlled kiln drying at source, making the moisture content optimum for its intended environment, which also achieves a superior finish when machined.


  • Grade A (unsorted)

This grade of Siberian Larch is the highest quality available, which has a limited amount of knots resulting in a selective, consistent look.

As classified by BS1186:3 Class 1

  • Grade B (sawfalling)

This grade allows some larger and a higher amount of knots, yet there is no compromise on durability and is well suited to timber cladding.

As classified by BS1186:3 Class 2

Fire Retardant for Timber

FRX Exterior fire retardant can be applied to Siberian Larch cladding when specified, to comply with national Building Regulations where Euroclass B or C are required. Applied under controlled conditions in a vacuum pressure timber impregnation plant. The treatment complies with ISO accreditation, which does not compromise critical properties such as strength, durability, corrosivity and hygroscopicity.

Alternatively, HR-Prof can be applied on site, a fire retardant that complies with Euroclass B or C for spread of flame, offering a quicker and sometimes cheaper option.

Weathering or Finishing

If left untreated, in the correct conditions Siberian Larch will weather to a subtle silver-gray.

Although naturally durable, Siberian Larch can be finished for protection against the elements, which will keep it looking consistent on all elevations of your project. Millworks can advise on different options for protecting your timber.

OSMO UV-Protection will prevent Siberian Larch from weathering. Or, OrganoWood can be applied to accelerate the weathering process, resulting in a more consistent silver-grey on all elevations


Stainless-steel cladding fixings should be used because natural oils in the timber have a corrosive effect on ferrous metals.

Trim Boards

Available sizes planed all round (mm)

19 x 43
19 x 93
19 x 143