ThermoWood® Microline Channel Cladding

From £30.41 £25.34 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 Microline Channel profile can be installed horizontally or vertically. A square sided recess where the boards meet creates bold shadow lines that will accentuate either the height or width of the façade. Microline Channel will lend a high-end contemporary appearance to any project. Boards connect with a tongue and groove system for easy installation.

Available in both SAWTEX™ (finesawn) and smooth face.  The SAWTEX surface will accept and retain coatings significantly better than a smooth face, thus improving the appearance and minimising future maintenance.

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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ThermoWood® Microline Channel 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 93mm / 20 x 118mm / 20 x 143mm (SAWTEX finish only available in 20 x 118mm).
  • Grade: Silva ThermoWood is produced from live knotted A/B grade, European Redwood.
  • Profile: Microline Channel has a tongue and groove connection and provides deep, bold shadow lines created by the square-sided recess.
  • Installation: Horizontal or vertical.
  • Surface texture: Select from SAWTEX finesawn finish (20 x 118mm only) or smooth finish.

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: ThermoWood has a lower water absorption rate than non-heat-treated wood. To overcome this, Silva uses a specially adapted formula of Sansin Enviro Stain – called SDF HT - which has been developed specifically for use on heat-treated wood.
  • Factory coating service: Silva ThermoWood Microline Channel 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 l-shaped, solid square, or 2-piece 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.

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

Size Texture Linear Metre Square Metre
20 x 93mm Smooth £2.45 £2.04 £32.19 £26.83
20 x 118mm SAWTEX™ £3.54 £2.95 £35.05 £29.21
20 x 118mm Smooth £3.09 £2.58 £30.63 £25.52
20 x 143mm Smooth £3.83 £3.19 £30.41 £25.34


  • Size: 20 x 93mm
  • Coverage: 76mm
  • Linear metres per square metre: 13.16
  • Size: 20 x 118mm
  • Finish: Smooth and SAWTEX
  • Coverage: 101mm
  • Linear metres per square metre: 9.90
  • Size: 20 x 143mm
  • Coverage: 126mm
  • Linear metres per square metre: 7.94
All coverage includes 2mm gap


Grade & Quality

Silva ThermoWood Grade & Quality Description

Technical Specification Sheet

Silva ThermoWood Channel Technical Specification Sheet


Up to 7 working days*.


£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


3-5 working days.



* Please allow up to 14 days for delivery especially at peak times.

** Exclusions apply.

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