SILVALarch™ Siberian Larch Channel 45 Weatherboard Cladding - 21 x 146mm

From £21.64 £18.03 per sqm From £21.64 £18.03 per sqm

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 give the heartwood a natural resistance to decay.

This channel weatherboard profile can be installed horizontally or vertically. Boards feature a 45 degree bevelled edge which form a recess where the boards meet to create bold shadow lines that will accentuate either the height or width of the façade.

SILVALarch Channel Weatherboarding is quick and easy to install, provides excellent weather protection, and allows for dimensional movement.

Clearance products are available for collection or local delivery only.

Wastage Allowance
Please ensure when ordering that you make an allowance for wastage. We recommend adding an additional 10-15% over and above your initial requirements. If using the coverage calculator within the configure and buy, a wastage allowance of 10% is built-in for your convenience.

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  • Product Name: SILVALarch™ Siberian Larch Channel 45 Weatherboard Cladding - 21 x 146mm
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SILVALarch™ Siberian Larch Channel 45 Weatherboard Cladding - 21 x 146mm

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A wastage allowance of 10% is built-in for your convenience.

SILVALarch Channel Weatherboarding is 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.

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. 

Product Details

  • Sizes: 21 x 146mm.
  • Grades: Selected lengths available in one of 3 SILVALarch grades. Each is hand-selected from the highest quality slow-grown Siberian Larch to meet our own stringent in-house quality standards.
  • Profile: Overlapping boards with a bevelled recess to create bold shadow lines.
  • Recess: Bevelled edge with 45-degree angle.
  • Installation: Horizontal or vertical.
  • 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 3 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. SILVA C grade is a more rustic grade, which is less restrictive on size and frequency of knots. Read more about grading and quality here - SILVA A, SILVA B, SILVA C.
  • Sourcing/certification: SILVALarch is sourced from sustainable forests in the Irkutsk region of Eastern Siberia, Russia, and comes with full 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 Tongue & Groove V-Joint 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 l-shaped, solid square, or 2-piece co-ordinating corner trims.
  • SILVALarch fascia and trim boards: View our range of SILVALarch boards. Available in 4 widths, they are perfect for fascias, barge boards, door and window reveals, and many more uses.

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

Size Grade Linear Metre Square Metre
21 x 146mm SILVA A £4.12 £3.43 £31.21 £26.01
21 x 146mm SILVA B £3.47 £2.89 £26.27 £21.89
21 x 146mm SILVA C £2.86 £2.38 £21.64 £18.03


  • Size: 21 x 146mm
  • Coverage: 132mm
  • Linear metres per square metre: 7.58

Coverage includes required 2mm expansion gap

Grade & Quality

SILVA A Grade & Quality Description.

SILVA B Grade & Quality Description.

SILVA C Grade & Quality Description.


Up to 5 weeks.


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

Free delivery is offered on orders over £2,000 + VAT**.

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


2-3 weeks.



** Exclusions apply.

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