Please note that iWood is a wholesale timber merchant, and to maintain such competitive prices, we have a minimum order amount of £750.00 ex VAT for delivery (£350.00 ex VAT for collection).

Thermowood - Buy Online

Thermowood is modified softwood produced through intense heat treatment up to 212 degrees C which removes almost all of the moisture within the timber and structurally modifies the timber for a much more stable and durable product. Due to this Eco Friendly approach to treatment. Thermowood does not leech chemicals typical of standard treated softwood much more attractive appearance.

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Please note that these images are to illustrate product type only and are not species specific.

Thermowood Information


Consistent warm dark brown colour featuring attractive timber knots for a natural wood aesthetic.

Timber Species

Scandinavian Redwood - Spruce (Picea abies) or Pine (Pinus Sylvestris)

The Tree

The redwood used to produce Thermowood can achieve growth up to 30m tall and 1m wide in favourable conditions.


Northern Europe, native to the Scandinavian Peninsula in the European Boreal Forest zone.


Thermowood is rated as class 2 'durable' and the BRE suggest a life span of around 30 years. Thermal modification improves stability, weather resistance and overall durability making it perfect for internal and externally timber panelling.

The Uses

The most common use of Thermowood is in External Cladding, Internal Cladding and Decking due to its exceptional stability and durability. Often used as the more cost effective option of Sauna's and other high moisture environments such as bathrooms and kitchens.