Valued for its beauty, stability, durability and thermal efficiency - Cedar has remained a species of choice for external claddings for centuries. Its durability has become legendary amongst gardeners with Cedar Greenhouses and Victorian home-owners with original Cedar conservatories. Today, these properties of Cedar, coupled with certified sustainable credentials, continue to make it a favoured modern construction material. It blends effortlessly with other facade materials to give a low-maintenance, contemporary appearance to many current building projects.
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.
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.
Larch is becoming increasingly popular for all types of cladding in the UK. It is a tough timber, dense and resinous at 750 kg/m3 (much denser than Pine or Cedar) and stable in use when dry. These hard-wearing durable qualities also make Larch the timber of choice for a number of other applications especially flooring where it has been used, for example, in various Olympic velodrome tracks around the world. It is the hardest of commercially available softwood species - Janka scale 1100 lb/in2 (European Redwood is 480 lb/in2).
The natural durability combined with independently verified environmental credentials has encouraged architects to specify this timber where a knotty, maintenance-free cladding is required.
The timber can be allowed to weather naturally, eventually achieving a uniform grey appearance. However, if that is not the required finish, Siberian Larch will accept all forms of paint, stain and surface preparation allowing an endless variety of colour tones to be achieved.