Thermory Thermo Spruce sauna wood is a thermally modified softwood designed for excellent performance in high-heat, high-humidity sauna environments. Using Thermory’s chemical-free thermal modification process, Spruce is heat-treated to improve stability, durability, and resistance to moisture-related movement while developing a deeper, more refined tone.

Thermal modification removes resins and excess moisture from the wood, significantly reducing the risk of warping, cracking, and swelling during repeated sauna heat cycles. This makes Thermo Spruce a reliable choice for sauna wall cladding, ceilings, and architectural interior surfaces where long-term performance is essential.

This collection includes Thermory Thermo Spruce materials for key sauna interior applications, including:

• Wall and ceiling cladding
  

• Structural and decorative sauna elements

Thermo Spruce features a rich, darker appearance than standard Spruce, with visible grain that delivers a more traditional Nordic sauna look. The thermal process enhances durability while maintaining a comfortable surface temperature suitable for sauna use.

All Thermory Thermo Spruce sauna wood is chemically untreated, sustainably sourced, and safe for high-temperature environments. Available in multiple profiles, board lengths, and pack configurations, Thermo Spruce supports both modern and traditional sauna designs.

Whether you are building a custom sauna or upgrading an existing interior, Thermory Thermo Spruce offers proven sauna performance, stability, and a classic Scandinavian aesthetic.