Siberian Larch Cladding


Siberian Larch Cladding Siberian Larch is a sustainable old-growth timber that has been used in construction for centuries. Its popularity lies in the fact that it is aesthetically beautiful, naturally durable and long lasting. Architects specify Siberian Larch cladding for a variety residential and commercial applications including schools, museums, stadiums and bridges.

The main benefits of Siberian Larch cladding are its impressive dimensional stability, low cost of installation, low maintenance, high manufacturing standards, and the fact that it is an aesthetically beautiful timber. However, the most amazing feature of Siberian Larch cladding is its natural resistance to decay.


Sawfalling I-IV grade. Full grading information can be found here.


Detailed installation information available here.

Species Information


Wood type Softwood
Environmental PEFC Certified
Distribution The native distribution for L. sibirica extends across Siberia to Mongolia and northern China. In Siberia it is extracted from 'natural forest' and most of this timber is extemely slow grown material. In the eastern part of its range it hybridises with L.gmelinii and is known asLarix x czekanowskii. L.sibirica is also grown in plantations in Austria, Norway and Finland yielding more quickly grown material. It has been introduced into Canada and northern USA.
The Tree This is a medium sized deciduous, coniferous tree ranging in size from 20m to 40m tall with a diameter of 1m or slightly more. In favourable situations a long, clean, cylindrical bole for two-thirds of its length can be achieved.
The Timber

The heartwood is pale reddish-brown to brick-red in colour, sharply defined from the narrow, lighter-coloured sapwood. It is a very resinous wood, with clearly marked annual rings. It has a straight grain, a fine, uniform texture and is rather heavy, weighing 590 kg/m³ when dried, it is likely that plantaion grown L.sibirica and that grown in more southerly Europe is of lower density. Its heartwood is listed as moderately durable, and its narrow sapwood means a high proportion of heartwood can be recovered for use.

Drying Difficult to dry due to its high resin content. Therefore it should be dried slowly to prevent checking and other drying defects.
Strength Likely to be similar to European larch which is about 50% harder than Scots pine and slightly stronger in bending and toughness. The strength values for slow grown L. sibiricamaterial are likely to be slightly higher than for faster grown plantation sourced material.
Working Qualities - Similar to European larch in that it saws, machines and finishes well but it tends to split on nailing and therefore drilling is recommended particularly at board ends.
Durability Moderately durable
Moisture Movement Reported to be small
Density (mean, Kg/m³) 590 ( Ranging from 570 to 650)
Texture Fine
Availability Available at specialist timber merchant
Use(s) Cladding, Joinery - Exterior, Flooring, Decking
Colour(s) Yellow brown (golden brown), Light brown, Reddish brown (pale)


British Standards Information

Natural Durability Class BSEN350:2 - Class 3 'Moderately Durable'
Sapwood Treatability Class BSEN350:2 - Class 2-3 'Moderately Easy to Treat'

FSC Certification

Siberian Larch - FSC Certified

Forest Stewardship Council (FSC) Accreditation

FSC is a world-wide, independent, non-profit, non-governmental organisation representing environmental and social groups and the timber and forestry industry. It aims to generate certification of forestry activity that incorporates clear guidelines and standards covering social, environmental and economic aspects of forest management.

Established in 1993 as a response to concerns over global deforestation, FSC is widely regarded as one of the most important initiatives of the last decade to promote responsible forest management worldwide

The FSC label provides a credible link between responsible production and consumption of forest products, enabling consumers and businesses to make purchasing decisions that benefit people and the environment as well as providing ongoing business value.

Chain of Custody (CoC)

The FSC Chain of Custody (CoC) certification system provides an audit trail from forest to final use. The rigour of the system is ensured by regular independent inspection at all stages in the supply chain.

FSC chain of custody (CoC) tracks FSC certified material through the production process - from the forest to the consumer, including all successive stages of processing, transformation, manufacturing and distribution.

Only FSC CoC certified operations are allowed to label products with the FSC trademarks. The FSC label thus provides the link between responsible production and consumption and thereby enables the consumer to make socially and environmentally responsible purchasing decisions.

Silva Timber Products meets the requirements for FSC Chain of Custody Standard FSC - STD - 40 - 004 (2004) within the BM TRADA Certification Limited Scheme for TRADA - Trak chain of custody certification

Certificate number:- TT-COC-002296

Finishing and Maintenance

It is recommended that a finish is applied to all surfaces, including ends, before installation. The type of coating wil be determined by the final finish and appearance desired.

Finish protects the wood from moisture absorption and UV degradation. It helps prevent staining caused by mildew and extractives and will increase the service life of the timber.

Consider one of our stunning finishes from the Sansin exteriors range. Click here to view the Sansin brochure.

A wide range of coating and stains are available to view here.

Silva Timber also offer a pre-finishing service, reducing installation time and on-site preparation.

Feel free to discuss your finish requirements with our customer support team on 0151 495 3111 or 01895 271 300. Alternatively email

Case Studies

Siberian Larch Cladding on Nursery
Siberian Larch Cladding Malvern Hills

Fire Treatment


Unique Fire Protection

When you need to comply with Building Regulations on fire protection, Silva can offer timber products impregnated with fire retardant treatment.  Specify either DRICON® for interior or weather protected situations or NON-COM® EXTERIOR for exterior or severe damp situations.

These proven industrial pre-treatments for timber and related substrates are applied under controlled conditions at the Arch Timber Protection’s ISO certified Fire Retardant Treatment Centre in Castleford.

The standard lead time for both DRICON® and NON-COM® EXTERIOR fire retardant treatments is 8 weeks.  Treatments can be applied to kiln dried Western Red Cedar cladding, trim, decking, shingles and shakes; Siberian Larch cladding and Eastern White Cedar shingles. Please contact us for further information or a quote.

Making sure you specify the correct fire protection is vital. Click here for the main considerations when specifying fire retardant protection for timber,that can help save fire damage costs and people's lives.

For detailed Frequently Asked Questions please click here.





Fire Retardant Treated Timber for Exterior or Severe Damp Situations

NON-COM® Exterior treated timber has been impregnated with NON-COM® Exterior fire retardant, a leach resistant, polymer based formulation which is an approved Type LR (leach resistant) formulation in the Wood Protection Association (WPA) Flame Retardant Manual.

NON-COM® Exterior is a Leach Resistant (type LR) fire retardant treatment suitable for exterior or severe damp situations without the need for a protective coating. However an approved coating can be applied if required. Ensure the coating to be used is compatible with NON-COM Exterior fire treated timber.
NON-COM® Exterior is available to conform with either Class B or Class C certification, depending on the application requirements. 

  • Allows you to meet fire regulations with a commercially proven, global product backed by extensive independent test data.  
  • Meets all relevant British and European Standards.
  • Fully fire tested in accordance with European Standards (Euroclasses) under the Construction Products Directive and classified in accordance with EN 13501-1.
  • Fully tested to BS476, Part 6 'Fire Propogation Test' and Part 7 'Surface Spread of Flame' .
  • Excellent appearance - leaves the appearance of the natural timber product virtually unchanged. 
  • Can be used externally, with or without a coating. 
  • Waterbased formulation applied by vacuum-pressure impregnation in factory controlled conditions, to ISO 9001 Quality and ISO 14001 Environmental standards. 
  • Kiln dried to end use moisture content. No strength reduction of treated timbers, and no corrosion of metal fastenings and fixings. 
  • Specification writing service available.

Silva Timber's Non-Com fire retardant treatment service provides the following assurances and benefits. When comparing our service to competitors, be sure to check the following are offered for a like-for-like comparison

  • Long history of proven performance
  • Accepted by the National House Building Council (NHBC) Building Control Service for exterior timber cladding
  • Independent classification reports for each timber species, timber thickness, for use with or without air gaps - BS EN 13501-1
  • Products listed by the UK Wood Protection Association
  • Products approved by the Fire Protection Association
  • Lasts the lifetime of the building with no maintenance - meets current FR durability standards - tested to TS 15912
  • Applied by an ISO 9001 and ISO 14001 accredited company
  • Applied to all faces of the timber product
  • Applied by a controlled impregnation process
  • From a supplier operating to the UK Wood Protection Association Quality Scheme
  • Treated with products manufactured by the supplier
  • Available for a wide range of species
  • Reduces smoke generation
  • Non-corrosive to metal fastenings
  • Does not reduce the strength of the timber
  • Non-hygroscopic - does not absord water or give rise to efflorescence
  • Can be used for exterior timbers without a protective coating
  • Treated products flee from surface salt deposits
  • Treated products have enhanced biological durability





Fire Retardant Treated Timber for Interior and Weather Protected Exterior Situations

DRICON® treated timber and sheet materials have been impregnated with DRICON® fire retardant, a water-based formulation which is an approved Type HR humidity resistant formulation in the Wood Protection Association (WPA) Flame Retardant Manual.

DRICON® is a Humidity Resistant (type HR) fire retardant treatment suitable for interior and weather protected exterior applications with or without a coating to the fire treated timber or plywood. It can only be used in an external situation prone to direct wetting if a well maintained protective coating/paint/stain is applied. Ensure the coating to be used is compatible with DRICON® fire treated timber/plywood as appropriate.

Please be aware DRICON® is not recommended for application on Western Red Cedar.

  • Allows you to meet fire regulations with a commercially proven global product backed by extensive independent test data.
  • The ONLY BBA certificated fire retardant treatment for timber (Certificate No 87/1841).
  • Fully fire tested in accordance with European Standards (Euroclasses) under the Construction Products Directive and classified in accordance with EN 13501-1.
  • Fully tested to BS476, Part 6 'Fire Propogation Test' and Part 7 'Surface Spread of Flame' .
  • Meets all relevant British and European Standards including the Construction Products Directive for panel products for used in permanent constructions.
  • Water based formulation applied by vacuum-pressure impregnation in factory controlled conditions, to ISO 9001 Quality and ISO14001 Environmental standards.
  • Non-hygroscopic formulation - unaffected by high and fluctuating relative humidities.
  • Does not significantly reduce strength of treated timber, non-corrosive to metal fastenings and fixings, does not affect paint finishes and adhesives, and is maintenance-free.
  • Specification writing service available.


To discuss your requirements, please feel free to contact our customer support team on 0151 495 3111 (Cheshire) or 01895 271 300 (W.London).