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Summary
Vincent Timber’s Thermowood D timber cladding offers PEFC-certified, heat-modified softwood with improved stability, low maintenance, and a dark natural tone for a reliable external cladding option.
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Application
Thermowood D softwood weatherboards are designed for external timber cladding, available in a range of profiles and sizes to suit both modern and traditional architecture. This versatile timber cladding solution is ideal for a variety of projects:
- Residential Housing - External walls, extensions, and renovations.
- Commercial Buildings - Offices, retail spaces and showrooms.
- Education Facilities - Schools and university buildings.
- Hospitality & Leisure - Garden rooms, lodges, and hotels.
- Public Sector - Libraries, community centres, and cultural spaces.
Other applications for Thermowood D cladding boards include external timber fins/louvres on a range of structures:
- Solar Shading Systems - Timber louvres and brise soleil for energy efficiency.
- Garden Structures - Screens, pergolas, and outdoor living spaces.
- Fencing – Strong and attractive timber for boundary and privacy solutions
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Description
Thermowood D is a heat-modified softwood cladding option, offering a rich, natural tone and enhanced stability for exposed exterior applications. Produced by treating softwood in high-temperature chamber kilns, the process changes the cellular structure, making Thermowood more dimensionally stable than untreated timber in variable climates.
The heat treatment uses only heat, vapour, and steam—no harmful chemicals—ensuring an environmentally responsible product. Thermowood can be left untreated to weather to a silver-grey finish or finished with stains, paints, or fire-retardant treatments for added protection.
Features and benefits:
- Premium Appearance: Dark, natural tone for stylish exterior timber cladding.
- Natural Durability: Classified as Durability Class 2, Thermowood D timber cladding provides excellent resistance to decay, moisture, and fungi, making it ideal for long-lasting outdoor applications.
- Eco-Friendly Process: Produced without chemicals, using heat and steam only.
- Versatile Finish: Accepts stains, paints, and FR treatments; can be left to weather naturally.
- Sustainable Choice: PEFC-certified timber from responsibly managed forests.
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Product certifications
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Color
Brown, Clear, Beige, Black, Blue, Cream, Green, Grey, Silver, White, Other, Red, Purple
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Finish
Smooth, Textured, Wood grain, Woodgrain, Sawn, Blackened, Burnt, Coated, Etched, Fine, Grained, Matt, Mill, Natural, Oil rubbed, Other, Painted, Planed, Pre-treated, Pre-weathered, Primed, Rolled, Sandblasted, Sanded, Treated, Stained, Unfinished, Weathered, Varnished
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Material
Timber
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Shape
Rectangle
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Length
1800 mm, 2100 mm, 2400 mm, 2700 mm, 3000 mm, 3300 mm, 3600 mm, 3900 mm, 4200 mm, 4500 mm, 4800 mm, 5100 mm, 5400 mm, 5700 mm, Bespoke
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Width
44 mm, 69 mm, 98 mm, 110 mm, 122 mm, 134 mm, Bespoke, 150 mm, 165 mm, 180 mm
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Height
Bespoke
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Warranty description
Other
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SKU Code
Thermowood D
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Specification
Classification data
General requirements
Heat-treated Scandinavian softwood (pine/spruce), kiln-dried, thermally modified for enhanced durability (Class 2), PEFC-certified.
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Standard
To BS EN 14915.
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Third-party certification
PEFC certified.
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Reaction to fire classification
To BS EN 13501-1, Class D-s2, d0.
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Release of dangerous substances
None.
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Water vapour permeability
High, μ ≈ 40–60.
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Thermal conductivity
0.13 W/m K.
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Sound absorption
Low; α ≈ 0.05–0.10.
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Resistance to fixings
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Wood species
European redwood.
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Quality of timber (exposed surfaces)
To BS EN 14519, Grade A/B.
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Profile
VT2562.
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Finished size
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Face width
122 mm.
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Thickness
21 mm.
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Biological durability
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Use class
To BS EN 335, Use Class 2.
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Preservative treatment
Not required.
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Flame-retardant treatment
Not required., Required (Euroclass B).
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Additional properties
Surface texture
Smooth., Planed., Textured., Brushed.
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Board length
1800 mm., 2100 mm., 2400 mm., 2700 mm., 3000 mm., 3300 mm., 3600 mm., 3900 mm., 4200 mm., 4500 mm., 4800 mm., 5100 mm., 5400 mm., 5700 mm.
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MoistureContent
4–6%.
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Density
350–480 kg/m3.
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Accessories
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Applied finish
Not required., Paint coating.
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Sustainability data
Contains Red List materials
No
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Country of material origin
Sweden
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Country of product manufacture
United Kingdom
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Manufacturing plant location
Sweden
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Material
Timber
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Carbon dioxide equivalent
Normalized unit
(kg CO₂ eq/kg) A1–A3 ('Production stage') :
0.42
A1–A3 ('Production stage') :
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A1–A3 ('Production stage') :
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Declared unit
Self-declared
A1–A3 ('Production stage') :
0.63
Self-declared
A1–A3 ('Production stage') :
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Self-declared
A1–A3 ('Production stage') :
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Recyclability
100% Recyclable
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Recycled content
0 %
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Expected Life
30 year
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