ThermoWood® Pine Rainscreen Cladding

From £46.44 (inc VAT) £38.70 (ex VAT) per sqm

Silva ThermoWood® is an attractive, sustainable solid wood material produced using a chemical-free natural process involving heat and steam. This thermal modification process makes it durable, dimensionally stable, resin-free, and even changes its colour to a pleasing warm brown. 

Silva ThermoWood Rainscreen cladding is installed horizontally with open joints, which enables good air circulation and allows for dimensional movement.

Rainscreen is chamfered on both edges enabling the boards to overlap and to drain water to the outside. The open joint creates strong shadow lines, which will accentuate the width of a façade. This type of cladding is suited to contemporary architectural styles.

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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ThermoWood® Pine Rainscreen Cladding

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ThermoWood is produced from Finnish-grown European Redwood (Scandinavian Pine) which is heat-treated to temperatures in excess of 200 degrees Centigrade. This process improves the properties of Silva ThermoWood making it an ideal material for use in exposed areas such as external wall claddings. 

Product Details

  • Sizes: 20 x 92mm / 20 x 117mm.
  • Grade: Silva ThermoWood is produced from live knotted A/B grade, European Redwood.
  • Profile: Rainscreen is an open jointed cladding style. It is designed to be installed with a gap between the boards and is chamfered to provide some overlap.
  • Installation: Horizontal.
  • Surface texture: Smooth.

Key Properties

  • Colour: An attractive warm brown colour consistent throughout the section of the piece.
  • Durability: Silva ThermoWood has a decay resistance of durability class 2 (durable) according to the EN 113 standard. A service life of 30+ years can be achieved, or 60+ years if a surface coating is applied at the outset and maintained periodically.
  • Stability: The lower equilibrium moisture content and the changes in the chemical composition of the wood during the heat treatment process make Silva ThermoWood less able to absorb and release water, thereby improving dimensional stability.
  • Density: The density of Silva ThermoWood is 350 – 480kg/m3 when its moisture content is 6% (typical for RH = 65%, t=20° conditions).
  • Thermal properties: According to VTT tests, ThermoWood’s thermal conductivity λ10 is in the region of 0.099 W/(m K). The corresponding value for untreated kiln-dried European Pine is 0.12 W/(m K).
  • Grading: To ensure Silva ThermoWood products meet the highest quality standards, only specially selected sound (live) knotted wood is used in the production process. The quality of sawn timber is controlled with a general grading system according to the number, quality, location, and size of the knots and other features. The quality grade used to produce Silva ThermoWood is A/B
  • Sourcing/certification: Silva ThermoWood is sourced from well-managed and sustainable forests that are fully certified under the Pan European Forestry Certification (PEFC) scheme.

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: Silva ThermoWood Rainscreen cladding 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.
  • Silva ThermoWood corner solutions: Select from our range of co-ordinating corner trims.
  • Silva ThermoWood fascia and trim boards: View our range of Silva ThermoWood boards. Available in 3 widths, they are perfect for fascias, barge boards, door and window reveals, and many more uses.

This ThermoWood® Rainscreen Cladding is 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.

Click here for more detailed information on our full range of Silva ThermoWood cladding.

Size Linear Metre Square Metre
20 x 92mm £4.29 £3.58 £46.67 £38.89
20 x 117mm £5.43 £4.53 £46.44 £38.70


  • Size: 20 x 92mm
  • Coverage*: 92mm
  • Linear metres per square metre: 10.87
  • Size: 20 x 117mm
  • Coverage*: 117mm
  • Linear metres per square metre: 8.55
* Based on 10mm gap between front face of boards


Grade & Quality

Silva ThermoWood 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.