Davidson Timber provides premium timber cladding solutions and serves as the UK’s reliable supplier of Thermowood cladding which achieves improved durability and stability by thermal modification making it ideal for both modern and traditional construction designs. Davidson Timber is a family-run timber specialist with a decade of hands-on experience who has provided Thermowood cladding for hundreds of successful UK projects. We work closely with architects, developers and contractors to guarantee project specifications fulfill the distinct needs of each assignment ranging from private homes to extensive commercial buildings.
Thermowood is widely recognised by architects, specifiers, and timber professionals as a reliable and sustainable choice for exterior cladding applications. Its performance is driven not just by its clean, contemporary appearance but by its enhanced technical characteristics, achieved through thermal modification. This process improves the wood’s durability, dimensional stability, and resistance to decay. Below, we explore why Thermowood cladding is increasingly specified for commercial, civic, and public-sector buildings across the UK, and why Davidson Timber continues to be a trusted supplier in this sector.
The controlled thermal treatment process enables Thermowood to reach enhanced durability with a 20 to 25 year lifespan in exterior applications while eliminating the need for chemical preservatives. Thermowood falls into Durability Class 2 according to BS EN 350 because of its inherent resistance to moisture damage, fungal decay and bugs which makes it an economical choice for rainscreen cladding and other exterior timber applications.
The Thermowood product achieves modern eco-building standards through its chemical-free treatment which makes it both safer and more sustainable. The dependable performance and stability of this product in the UK climate positions it as the preferred option for architects and developers who prioritize sustainability.
Davidson Timber distributes Thermowood for construction projects that prioritize both durable performance and low environmental impact.
“We often recommend Thermowood cladding for civic and educational buildings where enhanced durability, chemical-free treatment, and long-term performance are key.”
– Technical Team, Davidson Timber
Thermowood benefits from an intensive heat treatment which greatly enhances its dimensional stability. The treatment greatly decreases wood’s moisture absorption which minimizes swelling, shrinking, and warping while maintaining uniform performance throughout UK weather conditions. Davidson Timber obtains Thermowood from environmentally sustainable forests located in Finland and Europe. Our supply chain is supported by complete chain of custody documentation and the forests from which we source our materials follow strict environmental standards. We can produce FSC® or PEFC™ certification documentation when requested. Our sourcing practices support:
Thermowood cladding presents a dependable material option that both commercial projects and environmentally aware builders can use.
Thermowood is manufactured using natural timber and heat alone, without the use of chemicals or harmful substances. This thermal modification process enhances the wood’s lifespan and environmental profile, making it a responsible choice for external cladding. Davidson Timber maintains full supply chain transparency and works exclusively with certified mills that meet international sustainability criteria. Benefits of our supply chain include:
This makes Thermowood an ideal choice for projects focused on long-term performance and sustainability.
Both contractors and installers prefer Thermowood because of its reliable quality combined with superior workability. The boards are lightweight and easy to cut with standard tools which makes them ideal for traditional and modern construction techniques. Key practical benefits include:
Thermowood’s combination of stability and straight grain makes it perfect for façade detailing around windows, corners and transitions while ensuring architectural precision and quality elevation finishes.
Softwood
2.4m+
Can be fire treated to Euroclass B
Stainless Steel Fixings Recommended
Ex 25, 32mm x 50, 75, 100, 125, 150mm.
350 - 480kg/m3 when moisture content is 6%.
External Cladding.
Finland.
Medium/dark brown.
Durable.
Sourced from well managed forests.
Davidson Timber typically offers Thermowood D.
Thermal modification gives increased durability and stability - ideal for external cladding both coated, and uncoated.
Thermal modification increases stability.
Thermowood cladding is increasingly specified for commercial buildings that demand a clean, natural finish combined with reliable long-term performance. Davidson Timber frequently partners with commercial clients who require timber that delivers both architectural presence and compliance with strict durability and sustainability standards.
We supply Thermowood cladding to architects, contractors, and project managers working on:
Office and retail developments | Educational and healthcare facilities | Hospitality and leisure venues | Sustainable housing schemes | Civic and cultural buildings
Thermowood achieves Durability Class 2 (according to BS EN 350) following a chemical-free thermal modification process. This enhances the wood’s resistance to moisture, decay, and movement, making it ideal for vertical and horizontal rainscreen systems in exterior applications where stability and longevity are essential.
For commercial clients, Davidson Timber provides full technical support including:
Moisture content advice tailored to UK site conditions.
Detailed cladding profiles available in PDF and CAD formats.
Recommendations for coatings, fire-retardant treatments, or leaving boards untreated.
Fixing system guidance to support structural integrity and fire performance.
FSC® or PEFC™ sourcing certification and documentation for compliance.
Our range includes both standard and bespoke profiles to meet modern design goals as well as the requirements of heritage-sensitive projects.
We understand that time and consistency are crucial in commercial construction. That’s why we maintain an efficient supply chain with flexible delivery schedules and rigorous quality control, helping to reduce delays and site disruption.
Davidson Timber’s technical team remains informed of evolving British Standards and cladding regulations, ensuring that all Thermowood supplied meets the latest performance and compliance benchmarks. Our recommendations—such as selecting sawn versus planed boards, or specifying end-grain protection—are rooted in years of practical project insight.
To support clarity across all stages of a build, we provide straightforward guidance on Thermowood properties—covering expected colour changes, grain behaviour, installation advice, and detailing tips. This enables architects, installers, and specifiers to make informed, confident choices.
We’ve delivered Thermowood cladding to schools, hospitals, mixed-use developments, and bespoke residential projects—many of which required close coordination with contractors and design teams to ensure the right outcome for each unique scheme.
The main product line of Davidson Timber revolves around timber cladding while we specialise in Thermowood. We have delivered sustainably sourced performance-grade timber to residential and commercial customers throughout the UK for more than ten years. Becoming a member of Timber Development UK in 2014 showed our dedication to responsible sourcing while ensuring our practices match industry standards.
Thermowood cladding stands out as one of our top products because it combines enhanced durability with dimensional stability and moisture resistance through an environmentally friendly thermal modification process. Our team possesses comprehensive expertise regarding Thermowood’s performance across various UK climates which establishes it as a dependable option to chemically treated timber and imported hardwoods.
Davidson Timber delivers customized technical support to architects, developers and contractors while providing practical assistance through every phase from selecting appropriate profile dimensions to guidance about finishes and installation techniques. Our proven project experience underpins our recommendations so Thermowood cladding delivers strong performance and visual appeal in diverse applications.
Thermowood D Cladding is a heat-treated timber cladding product made from sustainably sourced softwood which provides enhanced durability along with stability and better resistance to moisture and decay. Commercial and residential buildings prefer Thermowood D Cladding for their external facades because of its superior performance together with its natural look.
The high-temperature heat treatment process makes Thermowood D an excellent choice for cladding because it provides durability, stability, and resistance to moisture and decay. The material demonstrates minimal warping or shrinking and needs low maintenance while maintaining its natural look which can either weather naturally or receive treatment to retain its color over time.
Thermowood D achieves high durability for outdoor use because its heat treatment process improves its resistance to moisture along with protection against decay and insect damage.
The expected lifespan of Thermowood D Cladding ranges from 20 to 30 years when used outdoors based on the surrounding environmental factors and maintenance practices. The lifespan of Thermowood D can be extended along with its appearance preserved through the application of UV-protective finishes and fire-retardant treatments.
Thermowood D offers both beautiful aesthetics and strong performance which makes it suitable for modern and traditional homes. The refined smooth finish of Thermowood D works well with modern design elements while its natural timber appearance matches classic and rustic styling. The product’s ability to adapt to various architectural designs remains intact regardless of whether it receives natural weathering or treatment through stains and oils.
Periodic cleaning of Thermowood D Cladding with water and a mild detergent helps keep dirt and debris at bay. Use a UV-protective oil or stain to maintain original color or it will develop a silver-grey patina through natural weathering. Checking regularly for signs of damage or wear will help extend its lifespan even though minimal maintenance is required because of its robust construction.
Thermowood D maintains sustainability because it comes from softwood responsibly obtained from certified sustainable forests like PEFC or FSC. The heat treatment method employs neither chemicals as it operates through high temperatures and steam rendering it an environmentally friendly solution for cladding.
The treatment of Thermowood D involves a high-temperature heating process which subjects the timber to temperatures between 180–212°C within a controlled steam environment. This method eliminates moisture from the wood while changing its structure and improving its strength and decay resistance naturally without chemical additives. The thermal treatment process produces timber that exhibits enhanced dimensional stability and weather resistance for exterior cladding applications.
The heat treatment process of Thermowood D delivers enhanced durability and stability along with improved resistance to moisture, decay and insects which makes it an eco-friendly option that needs less maintenance compared to both untreated softwoods and certain hardwoods. This solution offers both residential and commercial buildings a versatile cladding option because it combines lightweight properties with easy installation and fire-retardant treatment while being sustainably sourced for long-term durability.
Thermowood D qualifies as an eco-friendly product because it originates from sustainably harvested softwood and undergoes treatment through a non-chemical heat and steam process. Thermowood D’s extended lifespan along with its recyclable nature and low environmental impact position it as a sustainable cladding solution.
