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Thermowood Redwood - Carbon Neutral Timber Cladding

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Thermowood has a high resistance to moisture and decay which makes it a good option for exterior cladding. Thermowood is a straight grained softwood which offers a more consistent finish.

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Particularly suited to external cladding applications. Also suitable for internal cladding applications. Example applications include, but are in no way limited to:

  • Public buildings.
  • Residential buildings.
  • Schools.
  • Commercial buildings.
  • Restaurants.
  • Offices.


Softwood redwood timber cladding.

Features and benefits:

  • High resistance to moisture and decay which is beneficial for exterior cladding applications.
  • A straight grained softwood that offers a more consistent finish.
  • Thermally modified to increase stability and provide resistance against shrinkage, swelling and distortion.
  • Heat treated to a temperature of 180 degrees.
  • Resistant to sapwood treatment.
  • Wide choice of standard profiles.

Moisture movement:

Wood’s moisture content will change relative to its surroundings. Different species have different degrees of movement and this must be accounted for in cladding design.

Good design and installation practice will help minimize the effects of moisture:

  • Use eaves and overhangs to deflect rain - or flashing to protect the board tops.
  • Finish cladding at least 200 mm from the ground or a horizontal surface. Where possible use a surface that diffuses rain, such as gravel.
  • Board widths should generally be 4 to 6 times board thickness (typically less than 150 mm).
  • Design detailing must include measures that minimise water penetration.

General information






Pr_25_71_97_84 Softwood weatherboardsPrimary
Pr_25_71_97_55 Modified wood weatherboards


H21/116 Horizontal timber weatherboarding

H21/115 Vertical timber weatherboarding

H21/111 Horizontal timber weatherboarding

H21/110 Vertical timber weatherboarding

H21/15 Horizontal timber weatherboarding

H21/10 Vertical timber weatherboarding

Specification data - Softwood weatherboards


To BS EN 350:2:1994.

Third-party certification

PEFC certified.

FSC certified.

Reaction to fire classification

Timber cladding is suitable for buildings of 18 m or lower. No combustible materials are permitted for cladding on residential buildings over 18 m high.


Wood species

European redwood.


Insert requirements.


350–480 kg/m³.

6% moisture content.


Warm dark brown.


60 mm stainless steel annular ring shank nails. Flat head grade 304.

Use marine grade 316 for exposed areas such as tall

buildings or coastal locations. Screw holding strength is about

20% less due to the altered state of the cell wall during the

heating process.


Class 2 (to BS EN 350:2:1994).






60 years (occasionally wet); 30 years (frequently wet).

Sustainability data

Embodied carbon

A1-A3 (production stage) as defined in BS EN 15804

8.64 kg CO₂ eq/m²

The embodied carbon (kgCO2e/m2) in Ecova Clad Thermowood Redwood Timber Cladding has been independently calculated at 8.64 kgCO2e/m2. This Carbon is offset by Ecova Clad delivering a carbon neutral product.


100% Recyclable


Profiles Range

Profiles Range

Thermowood Redwood

Thermowood Redwood

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