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Koivu Group

Thermally modified ThermoWood® sawn and profiled timber for importers, distributors and architects, made in Finland

Vilppula, FinlandFounded 2006thermoholz.fiWebsite technologies

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Highlights

  • New on EvolcAdded 2026-10-29

About Koivu Group

Koivu Group, trading as HJT-Holz, produces and further processes thermally treated wood under the ThermoWood® trademark. The range includes rough sawn softwood and hardwood and profiled cladding, decking, battens and boards, graded for durability (D) and stability (S).

Customers are wood importers, distributors and architects. The company also offers custom thermotreatment services and keeps a stock of ready ThermoWood® for fast delivery. About 95% of production is exported.

The business started in 1997 and is a family-owned company; it has been a member of the Finnish Thermowood Association since 2000. The registered seat is in Vilppula, and production runs at eight heat treatment facilities in Vilppula and Kolho, Finland.

Product: Thermally modified softwood and hardwood sawn timber and profiled ThermoWood® products (cladding, decking, battens, boards)

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Website technologies

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  • Apache
  • Elementor
  • Google Tag Manager
  • Google reCAPTCHA
  • Termly
  • WordPress
  • jQuery