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ThermoWood cladding is a thermally modified timber cladding system developed to improve the dimensional stability, durability, and moisture resistance of softwood for external use. The thermal modification process alters the timber structure using heat and steam, reducing movement and increasing long-term performance without the use of chemical preservatives. ThermoWood cladding is widely specified for residential, commercial, and architectural projects where consistent appearance, durability in the UK climate, and low maintenance requirements are critical.
Our ThermoWood cladding range includes multiple profiles and board formats suitable for contemporary and traditional building designs. Boards are precision-machined and supplied kiln-dried, ensuring predictable installation performance across a wide range of external wall systems.
ThermoWood cladding is typically installed over treated timber battens with a ventilated cavity to manage moisture and airflow behind the façade. Fixing methods vary depending on profile type and orientation, with both concealed and face-fixed systems commonly used. Correct batten spacing, allowance for movement, and detailing at junctions are essential to ensure long-term performance.
Different ThermoWood profiles provide distinct visual and functional characteristics. Vertical timber cladding creates strong architectural lines and is commonly used in modern façades. Shiplap cladding offers overlapping boards with increased weather protection, while ThermoWood is also compatible with external decking applications such as timber decking boards.
When compared with untreated softwood, ThermoWood cladding offers improved dimensional stability and reduced moisture uptake, resulting in less movement over time. Against naturally durable species such as cedar or larch, ThermoWood provides a more consistent appearance and predictable performance, particularly in variable UK weather conditions. Unlike pressure-treated timber, ThermoWood is modified without chemical preservatives, making it suitable for projects where material consistency and long-term behaviour are critical.
ThermoWood is produced using a chemical-free modification process and is sourced from responsibly managed forests. When specified as part of a complete wall system, ThermoWood cladding can be detailed to meet UK Building Regulations requirements relating to durability and moisture management.
ThermoWood cladding should always be specified as part of a complete external wall system. Fire performance requirements depend on overall system design, fixing method, cavity detailing, and any applied treatments. Designers should consider cavity barriers, fixing layouts, and project-specific compliance with UK Building Regulations when specifying external timber cladding.
ThermoWood cladding is timber that has been thermally modified to improve stability, durability, and resistance to moisture without chemical treatments.
Yes. ThermoWood is widely used for external cladding in the UK due to its improved performance in variable weather conditions.
ThermoWood can be left untreated to weather naturally or finished with coatings if colour retention is required.
ThermoWood cladding is suitable for ventilated rainscreen installations when correctly detailed and installed.
For detailed material guidance, see our thermally modified timber cladding guide.