Bio-based / Board

Thermo-Ash cladding & decking

Thermally modified wood from Thermory, Estonia — modified with only heat and steam in computer-controlled kilns (no chemicals; 215°C for Thermo-Ash). CATAS-tested EN 350 durability: ash, spruce and oak Class 1 (25+ years), pine and radiata Class 2. EPDs for eight product categories, FSC and PEFC (2025-03-17), ISO 9001/14001/45001, Nordic Swan (outdoor wood, group 086), CE/DoP to EN 14915. Eight species; decking, cladding, flooring and saunas in 60+ countries.

Thermo-Ash cladding & decking representative image

Completes the third modification route (heat) after Accoya (acetylation) and Kebony (furfurylation). No chemicals means no hazardous-waste disposal — stated on…

Good for

  • Exterior cladding and decking needing Class 1 durability without preservatives
  • Sauna walls and benches — interior wood for hot, humid conditions

Consider

  • Thermal modification can reduce strength (notably impact toughness) — a finish material, not structural; EPD originals unread.
  • Virgin-wood based — a low-toxicity/durability record, not recycled; Korean availability unconfirmed.
Manufacturer
Thermory AS
Availability
Korea route unconfirmed
Checked
2026-09-04