Botanically known as Pinus Sylvestris, Thermowood is a softwood that originates from Scandinavia. In this post, we take a look at why Thermowood cladding is such a popular timber cladding option in the UK.

Thermowood Timber Cladding

Thermowood is a popular choice for timber cladding due to its unique production process and the numerous benefits it offers. It is sourced from well-managed forests, which ensures that it is sustainable and environmentally friendly. Thermowood timber cladding has PEFC certification and other certifications are also available on request, which provides the assurance that the wood is sourced sustainably.

One of the major benefits of Thermowood is its stability. Despite being of a brittle nature, it is very stable with low shrinkage, warping, and twisting. This makes it an ideal choice for cladding and other exterior applications where the material will be exposed to the elements. The density of Thermowood is 510 kg/m3, which makes it relatively heavy, providing it with added durability.

Thermowood cladding panels

Thermowood also boasts of a high thermal conductivity rating U-value of 0.107 W/m2 K which means it is a good insulator and can keep heat inside the building, which is an added advantage in cold regions. We are a Somerset timber cladding supplier and thermowood is commercially available in the UK in Thermowood D (Durable) Pine and it comes in sawn, planed, and profiled products in a limited range of thicknesses, widths, and lengths.

Durability is another key feature of Thermowood. The heat treatment process increases its durability, making it more resistant to decay. It is classified as Durable Class 2 as per BS 8417, which is an improvement from its original class 4. This makes it suitable for exterior applications and can last longer than non-treated wood.

More Reasons To Choose Thermowood

If you’re in the market for timber cladding, Thermowood cladding is a great option to consider. Produced through a unique heat treatment process, Thermowood is made from selected high-quality Scandinavian Redwood that is conditioned in a continuous kilning process, heating the wood to 212 Celsius while protecting it with steam. This thermal process enhances the chemical and physical properties of the wood, making it more durable and stable. In fact, Thermowood is classified as class 2 in BS 8417, which is an improvement from its original class 4. This means that it’s more resistant to decay, and can stand up better to the elements, making it ideal for exterior applications.


One of the key benefits of Thermowood timber cladding is its stability. On average, it’s 40% more stable than non-modified redwood, meaning it’s less likely to warp, twist, or shrink over time. This stability makes it an excellent choice for cladding and other exterior applications where the material will be exposed to the elements. Additionally, when left untreated and exposed to rain and sunlight, Thermowood develops an attractive silver-grey color, which can add character to the building.

Another attractive feature of Thermowood exterior cladding is that it is eco-friendly and sustainable. It is sourced from responsibly managed forests and the heat treatment process uses less energy than traditional methods, thus reducing the environmental impact. Additionally, because the heat treatment process improves the durability and stability of the wood, it doesn’t require any chemical treatment for preservation, making it a cleaner option for the environment.

Thermowood – A Great Timber Cladding Option For So Many Reasons

Thermowood is a high-quality, sustainable, and versatile option that offers a wide range of benefits for architects, builders, and homeowners. It’s durable, stable, and attractive, making it a great choice for cladding and other exterior applications. If you’re looking for high-quality, sustainable and versatile timber cladding, Thermowood is worth considering. Its unique heat treatment process enhances its durability, stability, and insulating properties. Its attractive silver-grey patina and sustainable sourcing make it an ideal choice for environmentally-conscious builders and architects.

Leave a Reply

Your email address will not be published. Required fields are marked *