THE FUTURE OF MODERN SUSTAINABLE WOOD PRESERVATION
As the construction and infrastructure sectors sharpen their sustainability ambitions, long lasting preserved timber continues to offer one of the most efficient pathways to reducing embodied carbon.
Modern preservatives significantly extend service life, locking carbon away for decades and reducing the need for replacement. Among the most widely adopted and trusted systems are Tanalith® E, Tanasote® and Vacsol®, each delivering targeted performance and sustainability advantages.
Tanalith® E: Multipurpose Protection for Outdoor Timber
Tanalith® E is a waterbased preservative combining copper with organic cobiocides for broad protection across Use Classes 1-4. Its reliability makes it a preferred choice for fencing, landscaping, decking and agricultural timbers exposed to the elements. The carefully optimised copper content helps balance durability with reduced environmental impact, while independently verified environmental data – EPDs and LCAs – supports more informed sustainability led specification.
Tanasote®: A Modern Oil Based Alternative for Heavy-Duty Use
Tanasote® is engineered for industrial scale, long service life applications such as utility poles, railway sleepers and high demand agricultural fencing. Developed as a modern alternative to creosote, it pairs copper with advanced cobiocides and delivers proven durability of up to 50 years. With approval under the EU Biocidal Products Regulation (BPR) and strong performance validation, Tanasote® offers high resilience in harsh environments while supporting long-term carbon retention.
Vacsol® and Resistol®: Metal-Free Protection for Internal and Protected Timber
Vacsol® and Resistol® provide a metal-free, VOC-free solution ideal for internal joinery, timber frames, roof battens and coated exterior joinery. The latest formulation delivers up to 60 years of service life when applied correctly. Its metal-free composition supports circularity, allowing simpler end of life reuse and recycling, while the concentrate format lowers transport emissions and aligns with modern low carbon construction demands.
Copper Market Dynamics: A Strategic Factor for Future Preservative Choices
Copper is central to many high-performance preservatives, particularly for outdoor and ground contact timber. Global copper prices have risen sharply due to increased demand from electrification, datacentre expansion and renewable infrastructure – combined with tightening supply from major mining regions. Prices reached record levels through 2025 and into 2026, and forecasts suggest the market may remain tight up to 2030 and beyond.
While the wood preservation sector uses only a small portion of global copper output, sustained price inflation could influence long-term cost structures. This underscores the value of continually evolving preservative technologies and maintaining flexibility across metal-based and metal-free systems.
The Next Decade: Emerging Potential for Metal-Free Exterior Options
As pricing pressures and sustainability expectations grow, metal-free preservatives may become increasingly viable for above ground structural applications Currently Tanalith® MF is available for above ground (UC3) applications such as timber cladding and decorative garden timbers – and in the future even decking systems – as technology advances into the 2030s.
Improvements in organic biocide chemistry, are likely to expand the range of applications where high-performance, metal-free solutions can deliver reliable durability.
Preservation Quality: The Foundation of Timber’s Sustainability
Confidence in timber as a low carbon construction material depends on consistent, high quality preservation. By selecting the appropriate preservative – Tanalith® E for outdoor use, Tanasote® for heavy duty applications and Vacsol® for internal or metal-free requirements – specifiers can maximise service life, reduce maintenance and reinforce timber’s role in the transition to a more sustainable built environment.
www.trusttreatedtimber.com
