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Vertical Grain Siberian Larch Decking

Vertical Grain Siberian Larch

Vertical Grain Siberian Larch (VG SILA) is a naturally durable and aesthetically pleasing product. It is particularly popular for projects with a requirement for both timber cladding and decking; using SILA can create a consistent look throughout the exterior of the project. 



Russwood’s VG SILA boards come in a warm mix of colours, from light reddish brown through to golden browns. The grain of the wood is exceptionally straight and the annual rings are close together. Growth rings mainly run in straight lines on the surface which means minimum risk of surface checking and minimum risk of splinters forming as a result of delamination between the growth rings. When exposed to the elements and sunlight, the colour of the deck will change to an even shade of grey. If used in a project alongside SILA cladding, the weathering of both products will ensure consistency of the overall look over time.

VG SILA is supplied as a mix of the highest Siberian larch grades with approximately 70% being virtually clear grade (knot free), resulting in a clean, contemporary timber decking option.

VG SILA is comprised of vertical and semi-vertical grain boards. Cut from the heartwood with growth rings ranging from 30 – 90° degrees, VG SILA is more stable than standard flat sawn boards.


  • Aesthetically refined and naturally durable decking
  • Particularly refined appearance when combined with GleitFix secret-fixings
  • Suited to high traffic areas
  • Natural durability; no chemical treatment required
  • Russwood’s SILA is FSC®-certified, meaning that it is sourced from well-managed forests
Density* Kg/m3 at 18% moisture content unless otherwise stated
628 - Dense
Very Good
Durability Class* 1 is 'Very Durable' > 5 = 'Not Durable'
Treatment Required
Environmental Certifications
Modified Timber
Lengths (m)
Up to 5.1m
Width (mm)
Price From** per m² excluding VAT

Grades and Specification

  • Graded to BS1186-3 Part 4 CSH/1; each board is practically centre free, one face will be sap free, knots have a maximum 25mm diameter and resin pockets, although not prevalent, are a natural characteristic of Siberian Larch
  • A maximum through knot size 25mm diameter
  • Chipped out knots permitted up to a maximum of 25mm diameter
  • Each board is pith free
  • End checks permitted not longer than 1.5 times width of board
  • Kiln-dried to moisture content of approximately 16-18% (±2%)
  • High density of approximately 628kg/m3 at 18% moisture content
  • PAR (Planed all round), 4 chamfered edges – RW212 profile
  • Lengths up to 5.1m supplied in running meters
  • FSC®-certified product sourced from sustainable forests
  • Each board is sap free on face
  • No limitation of splay knots

NBS Specification

For advice on completing the NBS Q55 for VG SILA decking please get in touch with our project team.


One of the primary benefits of SILA as a decking material is that it is one of the toughest and most durable softwoods. Unlike most commonly available decking timbers, it is naturally durable, being rated as Class 3 according to BS EN 350-2.

This means that it does not require any chemical treatment and, in comparison to pressure treated decking, has enviable environmental credentials.

This natural durability is the result of resin and extracts in the wood, combined with a high density, which reduces the wood’s vulnerability to rot, decay and insect damage. This is of key importance when considering a decking material, since a hard-wearing timber is required in order to ensure the long-term safety of the deck, regardless of its environment and level of footfall.

For enhanced durability and improved stability use GleitFix® for a secret fix solution or, for a face fix option, use KompeFix® with L-Go Fix® screws.

The way a deck is fixed and detailed can have a major effect on its lifespan. Our systems designed by Austrian Timber Engineers will make decking look better and last longer.


Russwood’s VG SILA is more dimensionally stable than standard flat sawn offerings. Flat sawn boards can move up to 50% more than vertical grain boards. This reduced propensity to move means minimal shrinkage and expansion.


SILA is a dense timber, classified by BS EN 350-2 as approximately 628 Kg/m3 at a moisture content of 18%. As such, it is not easily damaged and therefore is ideal for high traffic areas such as bridges, hotels, retail outlets and other commercial properties.


VG SILA decking is supplied in running meters in various lengths up to 5.1m. Please note that decking is supplied as a linear meterage based on random stock lengths at time of picking order. Other sizes may be available on request.


The way a decking board is fixed and detailed can have a major effect on its lifespan. We have teamed up with Austrian fixings specialists, Sihga, to provide a system that makes decking look better and last longer. We can write these systems into the NBS Q55 specification. The VG Sila decking can be secret fixed with GleitFix® or face fixed with L-Go Fix stainless steel screws and Kompefix. GleitFix® provides an ultra clean look with face free of fixings and enhanced durability due to all four side ventilation.

Virtual Samples

Click on the 3D icon to view virtual cladding samples. Tilt and zoom in on the sample to view the texture, grain and colour of the boards and use the highlight feature to see how light and shade affect the aesthetic.

Profile Options

VG SILA decking can be prodcued in the following profile.

Recommended Fixings

L-GoFix® A2 Screws

Face Fix

Cladding screw for effective fixing and neat detailing.

Learn more

L-BohrFix® A4 Screws

Face Fix

A highly corrosion resistant screw for special applications.

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Secret Fix

An innovative secret-fix solution for a flawless decking look.

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Decking substructure support adjustable in height from 35mm-500mm.

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Face Fix

Compensation strip designed to prevent direct contact between timber elements.

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