Bronsø
Thermo Wood Cladding
Bronsø
Thermo Wood Cladding
- EPD Verified
- Made in Denmark
- PEFC Certified
Bronsø is a thermally treated pine facade cladding developed for durable, low-maintenance building envelopes. The heat treatment improves stability and durability in outdoor conditions, reducing the risk of rot and ensuring long service life in exterior applications. With documented fire performance and standard installation principles, Bronsø is a reliable cladding with a significantly lower documented CO₂.
Bronsø is in collaboration with:
Bronsø is made from discarded pine
69%
Reduction in CO₂e compared to similar products
7.74 kg
Waste saved per m²
0.98 kg
CO₂e per m²
*CO₂e footprint is based on Bronsø EPD, including phases A1–A3 and C1–C4. Phase B and D are excluded. The comparison is based on average available EPD data for virgin thermos wood cladding as of April 2025. Declared unit for all compared EPDs: 1 m³ of thermo pine, average density 400–450 kg/m³
Why Choose Bronsø
Why professionals choose Bronsø for their projects
Bronsø is chosen for projects that require long-term facade performance with predictable installation and clear documentation. The system combines thermal stability, fire flexibility, and professional product support, making it suitable for both new construction and renovation where durability, compliance, and reliability matter.
EPD & PEFC Certified
EPD & PEFC Certified
Bronsø is delivered with a verified EPD, supporting CO₂e calculations and DGNB requirements. The product is EU Taxonomy compliant (M5.1) and certified according to PEFC standards, ensuring responsible wood sourcing.
Fire Saftey Tested
Fire Saftey Tested
Bronsø meets fire class D-s2,d2 as standard and can achieve B-s1,d0 with FR treatment, enabling specification in projects with stricter fire safety requirements.
Efficient Installation and Long Service Life
Efficient Installation and Long Service Life
Profiles are designed for straightforward installation using standard tools and substructures. The thermally treated wood provides dimensional stability and durability, with a documented service life of up to 30 years and limited maintenance requirements.
"We are very pleased to use upcycled products from a:gain. They have a concept that we aim to incorporate into most of our projects whenever possible. At Bakkekvarteret, we used Bronsø as façade cladding, which is an excellent alternative to virgin materials and is delivered with end-matched boards, meaning we have virtually no waste. It is just as easy to install as other cladding solutions, the price is fair, and this makes it an easy choice to use something more climate-friendly. We also build terraces, sheds, and windbreaks using a:gain’s products, so they have gradually become an integrated part of our standard materials."
Anders Mainz
Carpenter & Contractor / Tømrermester Anders Mainz
Boards between 1.8-5.4 m. Recommended to use falling lengths but can be delivered cut to size.
With fire retardant: B-s1, d0
Without fire retardant: D-s2, d2
Made In
Applications
Bronsø is developed for exterior facade cladding in both new construction and renovation projects.
- Exterior facade cladding
- Terraces
The thermally treated wood is suitable for ventilated facade constructions and can be installed vertically or horizontally depending on the chosen profile and design. Bronsø can also be used for terrace applications where a durable and dimensionally stable timber solution is required. In such cases, installation must follow relevant terrace construction principles.
Fire Performance
Bronsø meets fire class D-s2,d2 as standard.
When delivered with factory-applied FR treatment (Burnblock), the cladding achieves fire class B-s1,d0, enabling specification in projects with stricter facade fire requirements.
The FR treatment is pressure-impregnated for consistent protection throughout the profile, including cut ends. Burnblock is based on natural, biodegradable ingredients, contains no toxic substances, and does not wash out over time. No additional surface treatment is required for fire performance.
Appearances
See how Bronsø looks across different combinations
Bronsø profiles are delivered in varying lengths and widths, enabling flexible facade compositions. We recommend that bronsø is delivered in falling length and an end tongue and groove to reduce offcuts. Although, we can also deliver profiles cut to lengths.
Boards can be installed vertically, horizontally, or in mixed patterns to create rhythm and variation across the facade. The natural variation in length supports efficient material utilisation while contributing to a dynamic and authentic wood expression.
Select combination
Profile side view
Profile side view
Note: This image is a render used as an example
Unique wood features
Unique wood features
The wood selected for Bronsø is discarded due to knots, checks and other natural tree characteristics, which has no impact on the durability of the wood. The amount of knots and checks will vary, but the pictures in this section illustrates what should be expected.
Cracked knots without structural implication
Knot with corner missing
Knot cracks up to 3mm
Checks up to 3mm
UV Exposure
UV Exposure
Bronsø has a deep golden-brown tone from the thermal treatment. With continued exposure to sunlight, the surface will gradually turn silver-grey due to UV exposure. This process typically begins within 3–6 months after installation, depending on orientation, light intensity, and local climate, and continues until the surface reaches saturation.
The weathering process does not significantly affect the durability of the wood. As with all timber products, minor surface checks and fine cracks may develop over time - this is a natural characteristic of thermally treated wood.
If a warmer tone is desired, a surface treatment can be applied before or shortly after installation. Use a sustainable high-quality wood protection product with UV filters, preferably pigmented. Ask a:gain for suggestions on suitable alternatives.
Please note that a:gain is responsible for the thermo treatment only. Maintenance of any additional surface treatment must follow the coating manufacturer’s instructions.
Surface Structures
Surface Structures
Bronsø is available in four surface structures, allowing flexibility in the facade expression. The thermal treatment enhances the natural grain pattern, giving the surface depth and variation. Depending on the selected structure, the facade can appear smooth and refined or more robust and characterful.
Brushed with nylon/steel
Smooth-planed (standard)
Micro-embossed
Paintcutted
CO2e Footprint Calculator
Calculate the real impact of your next project
Use the CO₂e Footprint Calculator to estimate how much discarded material you prevent, and how much CO₂e you save, when choosing Bronsø instead of conventional cladding. This helps you document sustainability benefits in tenders, DGNB submissions, and client presentations.
Bronsø is produced from discarded wood and thermally treated using heat and steam, without chemical preservatives. The process enhances durability and stability while maintaining a clean material profile.
Compared to similar conventional cladding products, Bronsø delivers up to 77% lower CO₂e emissions (A1–A3), documented through a verified Environmental Product Declaration (EPD). This supports project-level LCA calculations and helps reduce the building’s total climate impact.
Bronsø is PEFC certified, ensuring responsible sourcing of wood, and compliant with EU Taxonomy requirements (M5.1).
Bronsø Production Process
1. Sorting & Collection of discarded wood
Planks that would normally be discarded due to aesthetic imperfections are collected and carefully sorted for processing and reprofiling.
2. Reprofiling
The selected planks are reprofiled to ensure consistent lengths, widths, and profiles - creating a cladding product fully comparable to conventional alternatives.
3. Installation
Bronsø is installed just like any other standard wooden facade cladding that carpenters are familiar with. The use of falling lengths during installation ensures minimal material waste.
4. Demounting
If a building is to be renovated or demolished, Bronsø is designed for easy disassembly and can seamlessly enter our take-back system for reprofiling and reuse.
Certifications
See Bronsø's certifications
EU Taxonomy
Bronsø complies to EU taxonomy M5.1, which serves the purpose of collecting documentation in the supply chain in connection with (EU) Regulation 2021/2139, appendix C regarding technical screening criteria supplementing Regulation (EU) 2020/852 establishing a framework to facilitate sustainable investment.
CE Marking
Bronsø FR treated version is certified in compliance with Regulation 305/2011/EU following the standard EN 14915:2013.
PEFC
PEFC is a globally recognised certification for sustainable forest management, promoting environmentally responsible practices, social responsibility and traceability. Bronsø thermowood holds the PEFC label.
Downloads
Access all Bronsø specifications, certificates, resources and images
Product Booklets
An overview of Bronsø’s product details.
Price List
Overview of Bronsø cladding prices, variants, and lead times.
Project Reference Booklets
A collection of completed reference projects.
Installation & Maintenance
Step-by-step installation and maintenance instructions
Technical Data
Bronsø's performance overview, classification, installation requirements, and compliance standards.
Environmental Documentation
A verified EPD for Bronsø and a short explainer of its CO₂e results.
Render Assets
Bronsø seamless textures
Tender Descriptions
Tender descriptions detailing technical, sustainability, and procurement criteria.
Declaration confirming Bronsø’s compliance with EU Taxonomy Appendix C.
CE certification and DoP documenting Bronsø’s fire rating and regulatory compliance.
DGNB
DGNB-related documentation and compliance data.
Technical drawings showing all Bronsø cladding profiles from 1 to 13.
Project close-ups showing Bronsø’s texture and weathering.
Large-scale project images showcasing Bronsø cladding across diverse buildings.
Product Booklets
Product Booklets
Price List
Price List
Project Reference Booklets
Project Reference Booklets
Installation & Maintenance
Installation & Maintenance
Technical Data
Technical Data
Detailed technical specifications, dimensions, tolerances, and performance data.
Environmental Documentation
Environmental Documentation
Render Assets
Render Assets
Tender Descriptions
Tender Descriptions
EU Tax. M5.1 Compliance
EU Tax. M5.1 Compliance
Documentation for EU Taxonomy alignment (M5.1 compliance).
CE & Fire Documentation
CE & Fire Documentation
DGNB
DGNB
Profile Drawings
Profile Drawings
Technical profile drawings including dimensions and cross-sections.
Close-up Product Images
Close-up Product Images
FAQS
Frequently Asked Questions
General
Covers what Bronsø is, how it behaves outdoors, durability, maintenance, and what to expect from its natural upcycled wood characteristics.
Does it effect the durability that the wood is discarded?
Does it effect the durability that the wood is discarded?
No, the wood is thermo treated all the way through, and the wood is therefore protected in cracks and where nots have fallen out. The wood does not absorb moisture to the same degree as untreated wood.
Does Bronsø contain any hazardous substances?
Does Bronsø contain any hazardous substances?
No, the treatment consists exclusively of the use of heat and steam at temperatures between 190° and 212° C. The finished product is 100% natural and completely free of chemicals. During the heat treatment, resin, turpentine, and formaldehyde disappear, which makes the wood resistant to fungal and mould attacks and places the wood in durability class 2 without oil treatment.
What fire retardant/impregnation do you use?
What fire retardant/impregnation do you use?
The wood can be supplied fire-impregnated using Burnblock technology, achieving a fire classification of B-s1,d0. The fire impregnation solution is made entirely from natural ingredients, is 100% biodegradable, contains no toxic substances, is pH-neutral, and holds Cradle-to-Cradle GOLD certification. The impregnation is non-leaching and requires no additional surface treatment.
Does Bronsø need any surface treatment?
Does Bronsø need any surface treatment?
No, Bronsø does not require surface treatment. Thermo wood is naturally classified as durability class 2 ("durable") according to BS EN 350 standards. It is endorsed by the British Research Establishment (BRE) with an expected service life of 30 years when used for cladding or decking
Customisation & Variants
Explains available profiles, sizes, and natural variations, and how these options influence the final look of the cladding.
Can I order a customised Bronsø cladding?
Can I order a customised Bronsø cladding?
Yes, you can customize Bronsø cladding by mixing our standard profiles to create a unique look for your project. For large orders, we can tailor the profile to your specific requirements. However, the thickness is fixed at 18mm, the board width depends on available stock, and all boards are supplied in falling lengths.
