SILVALarch™ Siberian Larch Boards - 20x44mm / 20x95mm / 20x120mm / 20x145mm

From £3.01 (inc VAT) £2.51 (ex VAT) per linear metre

New size: 20 x 44mm / 20 x 95mm / 20 x 120mm / 20 x 145mm

The wood of Siberian Larch is highly valued for its remarkable properties and performance characteristics. It is strong and durable, possessing unusually high levels of resin, which gives the heartwood a natural resistance to decay. 

With its lustrous golden-brown colour and striking grain patterns, SILVALarch has a highly attractive appearance. Its good looks and physical/mechanical properties make it much sought after for exterior applications, particularly as a cladding material.

Before purchasing, please read the full product description and technical information in the tabs below.

Wastage Allowance
We recommend adding an additional 10-15% over and above your initial requirements.

Items listed as 'in production' have an extended delivery lead-time of up to 5 weeks. Standard delivery lead-times apply to all other products.

There is a £450 (ex VAT) / £540 (inc VAT) minimum basket value applicable to all orders containing cladding, decking, and fencing products. Read the full details.

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  • Product Name: SILVALarch™ Siberian Larch Boards - 20x44mm / 20x95mm / 20x120mm / 20x145mm
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SILVALarch™ Siberian Larch Boards - 20x44mm / 20x95mm / 20x120mm / 20x145mm

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SILVALarch boards are produced from the highest quality slow-grown Siberian Larch from the Irkutsk region of Russia, an area that experiences long cold winters and short summers. Wood from this harsh climate is much sought after for its natural growth characteristics – exceptionally slow-growing and, therefore, dense with tight grain.

There is a vast range of end uses for our SILVALarch Siberian Larch boards. Combine the different board widths to create board and batten (board-on-board) style cladding, which adds a sense of depth and texture to any façade. SILVALarch boards are used for open jointed cladding, fascia, barge boards, door and window reveals, corner trim, fences, horizontal slatted screens, and many more applications.

Product Details

  • Sizes: 20 x 44mm / 20 x 95mm / 20x120mm / 20x145mm.
  • Grades: SILVALarch is available in two grades. Each is hand-selected from the highest quality slow-grown Siberian Larch to meet our own stringent in-house quality standards.
  • Profile: Boards.
  • Surface texture: Smooth.
  • Moisture content: Kiln-dried at source to 16–18% (+/-2%).

Key Properties

  • Colour: The overall colour of Siberian Larch is a lustrous golden-brown. However, closer inspection will reveal a range of colours varying from the creamy white of the narrow sapwood to the straw-coloured or dark, reddish-brown of the heartwood.
  • Durability: 50+ year service life. Decay resistance of ‘Class 3 Moderately Durable’.
  • Stability: Siberian Larch has low permeability, so it can cope with varying levels of humidity without absorbing much water. Thus, it will not shrink or swell excessively in service.
  • Density: Siberian Larch is an extremely dense and hard timber, therefore able to withstand knocks and scrapes. Weighs 570 to 650 kg/m3 when dried to 12% moisture content.
  • Thermal properties: Coefficient of thermal conductivity (k) of 0.13 W/m °C at 12% moisture content. Insulation value is approximately 15 times better than masonry, 400 times better than steel, and 1,770 times better than aluminium.
  • Acoustic properties: Can dampen vibrations making it particularly effective for use as interior panelling.
  • Kiln-dried: SILVALarch is kiln-dried, giving it many advantages. The process improves dimensional stability, permits the immediate application of a coating, and enables installation with minimal site acclimatisation.
  • Grading: SILVALarch is available in 2 grades. SILVA A grade offers a clean, relatively knot-free appearance and is ideal for design-led projects. SILVA B grade displays well-interspersed knots with some boards free or practically free of knots. Read more about grading and quality here - SILVA A, SILVA B.
  • Sourcing/certification: SILVALarch is sourced from sustainable forests in the Irkutsk region of Eastern Siberia, Russia, and comes with FSC chain-of-custody certification.

Optional Extras

  • Coatings: The application of a coating is necessary to protect the wood and optimise its appearance over time. The coating should be applied to all surfaces, including ends, before installation. Choose from our wide range of high-performance wood coating systems.
  • Factory coating service: SILVALarch Boards can be supplied factory coated. Having the coating pre-applied on all sides enables it to be installed at any time of year, regardless of the weather or temperature. Please Contact Us for a quotation.
  • SILVALarch corner solutions: Select from our range of co-ordinating corner trims.

These SILVALarch™ Siberian Larch Boards are graded on one face only. Boards are not reversible and, as such, some surface/roller marks may be expected on the rear of the boards.

For more detailed information, view our full range of Siberian Larch Cladding.

Size Grade Linear Metre
20 x 44mm SILVA A £2.51£3.01
20 x 95mm SILVA B £3.44£4.13
20 x 120mm SILVA A £5.16£6.19
20 x 120mm SILVA B £4.56£5.47
20 x 145mm SILVA A £6.91£8.29
20 x 145mm SILVA B £6.11£7.33


  • Size: 20 x 44mm
  • Coverage: 49mm
  • Linear metres per square metre: 20.41
  • Size: 20 x 95mm
  • Coverage: 100mm
  • Linear metres per square metre: 10.00
  • Size: 20 x 120mm
  • Coverage: 125mm
  • Linear metres per square metre: 8.00
  • Size: 20 x 145mm
  • Coverage: 150mm
  • Linear metres per square metre: 6.67
All coverage includes 5mm gap


Grade & Quality

SILVA A Grade & Quality Description.

SILVA B Grade & Quality Description.



2 weeks for in stock items.

Up to 5 weeks for items in production.


£45.00 / £95.00 / £145 / £195.00 / POA depending on location.

You can view our detailed delivery charges and services here.

Please note: As with most building supplies, delivery is to the kerbside only.

Scheduled Collection


Typically within 48 hours (subject to stock availability).

Up to 5 weeks for items in production.