Thermoarena

What Thermoarena does

Thermoarena OÜ is a privately held Estonian manufacturer of thermally modified wood (thermowood), founded in 2012 and headquartered in Koigi village, Järva County, with an 11-50 employee base. The company operates a chemical-free thermal modification process at 180-220°C using steam-protected kilns that reduce wood moisture to 4-6%, yielding durability class 1-2 (15-25+ year lifespan) products across Thermo Pine, Spruce, Ash, Ayous, and Frake species. Its portfolio comprises three core categories — decking, cladding, and thermally modified lumber — augmented by enhanced variants: Burnblock fire-retardant impregnation achieving Euroclass B-s1,d0 (Cradle to Cradle Gold certified) and a proprietary clip system enabling screw-free installation.

Revenue is generated through two streams: direct B2B sales of finished thermowood products and thermal modification-as-a-service for third-party sawmill and wood-sector customers. The company sells via direct sales to architects, designers, construction companies, and building-material distributors, with no publicly disclosed pricing — customers submit price inquiries through the website. Over 90% of an annual production volume exceeding 28,000 m³ is exported to 30+ countries across the Nordics, broader Europe, Asia, and Oceania. Certifications (PEFC, FSC, CE, Cradle to Cradle Gold) and demonstrated reference projects — including Estonia's first 13-floor thermowood-facade high-rise — anchor its positioning in sustainable, fire-rated wood applications. Capital structure is privately held with no disclosed institutional investors; the company has accessed EU Regional Development Fund and NextGenerationEU grants for capacity expansion and sustainability upgrades, and operates a wholly-owned subsidiary, Burnshield OÜ, dedicated to fire-retardant impregnation services.

Name

Thermoarena

Legal name

Thermoarena OÜ

Website

https://thermoarena.com

Company type

Private

Founded year

2012

Operating status

Operating

Headcount range

11–50 employees

Short description

Thermoarena OÜ is an Estonian manufacturer of chemical-free thermally modified wood (decking, cladding, lumber) serving architects, builders, and distributors across 30+ countries, with enhanced fire-retardant and clip-system variants.

Ownership category

akta.pro rank

Product category

Thermally Modified Wood Products

NAICS

Wood Preservation (321114), Sawmills and Wood Preservation (32111)

SIC

Lumber & Wood Products (No Furniture) (2400), Wholesale-Lumber, Plywood, Millwork & Wood Panels (5031)

akta.pro primary industry

Treated Wood & Preserved Timber Products (IMADADAE)

akta.pro secondary industries

Wood Preservation & Pressure Treatment (IMAMABAF), Wood Treatment & Preservation for Engineered Wood Products (IMAMACAM)

Keywords

• Thermally modified wood
• Wood cladding boards
• Wood decking boards
• Fire-retardant wood
• Engineered timber products

Headquarters

HQ city

Järva-jaani

HQ country

Estonia

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Infrastructure, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Thermowood Product Sales: Sale of thermally modified wood products including decking, cladding, and lumber. Products are sold as materials to customers.
2. Thermal Modification Service: Thermoarena offers thermal modification as a service for wood sector and sawmill companies, processing their materials in their facilities.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

Thermoarena OÜ manufactures thermally modified wood (thermowood) products — decking boards, cladding/facade boards, thermally modified lumber, beams and joists — using a chemical-free process that heats wood to 180-220°C under steam protection to deliver durability class 1-2 material with 4-6% moisture content. The company also offers Burnblock fire-retardant-treated cladding (Euroclass B-s1,d0), a proprietary clip-based installation system, and thermal modification as a toll-service for sawmill and wood-sector clients.

Product overview

Thermoarena is a manufacturer of thermally modified wood (thermowood) products, operating a chemical-free thermal modification process at temperatures of 180-220°C. The core product portfolio consists of three main categories: Decking (terrassid), Cladding (voodrilauad), and Thermally Modified Lumber. The company offers enhanced variants with fire-retardant Burnblock treatment and proprietary clip-based fastening systems for screw-free installation. Products are manufactured from sustainably sourced wood including Thermo Pine, Thermo Spruce, Thermo Ayous, Thermo Ash, and Thermo Frake species, with annual production capacity exceeding 28,000 m³.

Differentiator

Problem solved

Functional benefit

Brands

• Burnshield: Subsidiary brand specializing in fire-retardant wood treatment using Burnblock technology. Offers deep impregnation services for wood products with 100% natural fire retardant.

Products and services

• Thermally Modified Wood Decking (Terrassid) Thermally modified wood decking boards with profiles including D5, D6, SHP and clip-based systems, providing weather resistance and dimensional stability for outdoor terrace applications. Sold to architects, construction firms and distributors.
• Thermally Modified Wood Cladding (Voodrilauad) Thermally modified wood cladding boards for exterior facade applications, available in multiple profiles (UTS, UTV, UYS, UYV, HSS, SHP, VCLIP). Sold to architects, construction firms and building material distributors for residential and commercial facades.
• Thermally Modified Lumber (TM Lumber) Thermally modified hardwood and softwood lumber in various dimensions, sourced from PEFC-certified Finnish sawmills, including Thermo Pine, Thermo Spruce, Thermo Ayous and Thermo Frake species. Sold to manufacturers, builders and distributors.
• Cladding with Burnblock Fire Retardant Fire-retardant thermally modified cladding boards treated with BURNBLOCK natural fire retardant powder, achieving B-s1,d0 reaction to fire classification. Available in Thermo Ash, Thermo Pine and Thermo Ayous. Sold for public buildings and projects requiring Euroclass B fire ratings.
• Cladding with Clips System Thermally modified cladding boards designed for use with a proprietary clip fastening system that enables quick installation without visible screws, suitable for vertical, horizontal or diagonal mounting. Sold to installers and construction firms seeking faster, cleaner facade builds.
• Decking with Clips System Thermally modified wood decking boards designed for screw-free installation using a specialized clip system that allows boards to expand and contract with weather changes. Sold to installers and construction firms for terrace and outdoor projects.
• Beams and Joists (Talad) Thermally modified pine beams and joists in various dimensions for supporting decking, cladding and ceiling installations, including specialized profiles for clip systems. Sold as accessory structural components to installers and builders.
• Thermal Modification Service Toll thermal modification service for sawmill and wood-sector companies that supply their own timber for processing in Thermoarena's kilns. Sold to industrial wood-sector buyers wanting thermally modified variants without investing in kilns.

Quantifiable outcome

• Moisture content reduced to 4-6% resulting in minimal expansion/contraction
• +3 more outcomes

Named customers1 record

Segments4 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• BestNoFirecoreStrategic or Co-development PartnerBestNoFire is a subsidiary company created by Thermoarena to specialize in wood and plywood impregnation with Burnblock fire retardant chemicals. It represents Burnblock in Baltic Countries and performs the specialized vacuum-pressure fire retardant treatment.

Scale indicators7 records

Recent moves8 records

Expansion highlights5 records

Market position

Strengths5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/thermoarena
• LinkedInlinkedin.com/company/thermoarena-ou

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Thermoarena