Our Thermowood is produced by the Finnish company Oy Lunawood Ltd, who are one of the world's leading producers of Thermowood. They were forerunners in the development of thermally modified timber and founder members of the International ThermoWood Association.

We are proud to be exclusive ex-quay distributors of the Lunawood brand and Sales Agents in the UK and Ireland.

Production process

Thermowood is produced by heat treating selected Scandinavian Redwood (Pinus sylvestris). Lunawood use Northern Scandinavian Redwood that is conditioned in a unique continuous kilning process, heating the timber to 212° Celsius whilst protecting it with steam. This thermal process enhances the chemical and physical properties of the timber providing many benefits. In external applications (BS EN 335 Use Class 3) Lunawood meets the requirements of Durability Class 2         (BS EN 350).

After thermal modification the timber becomes naturally durable making it suitable for use as cladding, decking or other outdoor applications, without the need for toxic chemical preservative treatment. Thermal modification can also be applied to other timber species.

Our Thermowood (Lunawood) is recognised by the Building Research Establishment (BRE) which endorses a 30 year service life when used for cladding and decking.

Lunawood is also certified with the European Standard CE mark ensuring it meets EU consumer safety, health and environmental requirements.

Thermowood properties

In addition to natural durability, thermal modification provides other benefits.

The timber darkens to an attractive deep brown making it ideal for timber cladding and decking. The colour change is consistent throughout the thickness enabling further cutting, drilling or shaping, without the need for additional preservative treatment and without affecting the durability or service life.

The changes to the physical properties give Thermowood greater stability over untreated or chemically treated timber. This means that Thermowood suffers less shrinkage, swelling, cupping and distortion than ordinary wood. This is demonstrated in the technical study carried out at the Helsinki University of Technology. See study.

This environmentally friendly product is PEFC certified; ensuring timber is sourced from well managed sustainable forests.

"Given its inherent stability, durability, maintenance-free longevity and ecological credentials we felt Lunawood's Thermowood was the most appropriate choice for the timber cladding at our student residences project, Sugarhouse Close."

Valentin Hunzinger
Oberlanders Architects LLP


Lunawood Brochure

Lunawood Product Portfolio

Lunawood Environmental Product Declaration