Thermally modified wood -
a combination of style and durability

Certificate Certificate Certificate

In addition to untreated wood, we manufacture products for indoor and outdoor use from thermally modified wood. Thermal modification, also known as heat treatment, improves the wood’s resistance to decay and weather conditions, its thermal insulation capacity, as well as its dimensional stability in conditions with fluctuating moisture levels.

Thermally modified wood is darker in color than untreated wood, which gives it a fine hardwood look. This factor alone is often reason enough to choose thermo wood.

Individual solutions to fulfil your wishes

Karava has long, solid expertise in wood modification by heat treatment. Our production technique is patented, and we supply thermally modified wood to large companies in the wood industry, for instance.

In addition to our production technique, our high quality is built on having control of the entire production chain. We select the wood from our trusted partners and perform the thermal modification at our own heat treatment facility in Mänttä-Vilppula. The actual products are then manufactured by hand at our carpentry shop in Pirkkala.

Karava is authorized to use the ThermoWood® trademark

ThermoWood is a trademark registered by the Finnish ThermoWood Association. It may only be used by the members of the association, as well as partners cooperating with the association on matters such as quality control and research. The ThermoWood product classification consists of two classes with different end use applications: Thermo-S and Thermo-D.

Properties of thermally modified wood

Heat-treated Thermo-S; applications

The letter ‘S’ in the name stands for stability. Along with appearance, it is indeed a key feature of the end use applications of this product class.

Thermo-S Softwood
• Building components
• Furnishings in dry conditions
• Fixtures in dry conditions
• Furniture
• Garden furniture
• Sauna benches
• Door and window components

Thermo-S Hardwood
• Furnishings
• Fixtures
• Furniture
• Flooring
• Sauna structures
• Garden furniture

Heat-treated Thermo-D; applications

The letter ‘D’ in the name stands for durability. Along with appearance, it is indeed a key feature of the end use applications of this product class.

Thermo-D Softwood
• Exterior cladding
• External doors
• Window shutters
• Open space constructions
• Sauna and bathroom furnishings
• Flooring
• Garden furniture

Thermo-D Hardwood
• Darker color compared to Thermo-S
• Furnishings
• Fixtures
• Furniture
• Flooring
• Sauna structures
• Garden furniture

If a darker color is desired, Thermo-D should be used.

Standard dimensions

In addition to our standard dimensions, we can also follow individual specifications.

Thermo ash
21×42 21×65 21×92 21×118 21×130
26×42 26×65 26×92 26×118 26×130

Thermo pine
21×92 21×118 21×142
26×92 26×118 26×142
42×92 42×118 42×142

Thermo spruce
21×92 21×118 21×142
26×92 26×118 26×142
42×92 42×118 42×142

Thermo aspen*
15×70 15×90 15×120
28×90 28×120 28×140

Lengths:
Thermo aspen 1,8m to 3m
Thermo ash 1,8m to 3m
Thermo spruce and pine 3m to 5,4/5,8m

Profiles:
SHP
SH
UTV
UYL
Rombus
Decking

*Kallio, Kallio Groove, STP and SHP