This is WEI-IEO, European industry trade association

The European Institute for Wood Preservation, WEI-IEO are the European industry trade association representing the treated wood industry.

The association was founded in 1951 and with registered office in Brussels under Belgian law. The statutes that is the base of WEI-IEO defines the association, membership and activities and membership is open to those who share our goals and fulfil the requirements specified in the statutes.

With over 140 member companies across Europe, WEI-IEO serves as a hub for the wood preservation industry, providing technical, commercial, and legal advice to its members.

At WEI-IEO, we believe in advancing the science and technology of wood preservation, promoting high standards of quality and safety, and advocating for sensible regulation that supports the industry’s long-term viability. We work closely with policymakers, researchers, and other stakeholders to promote a better understanding of the role of wood in the built environment, and to ensure that it is used responsibly and sustainably.

Our activities include monitoring and advocating for fair and effective legislation, developing quality standards for wood preservatives and treated timber, and participating in research and development projects that help identify new and better ways to treat and preserve wood. We also serve as a focal point for consultation within and between the European wood preservation industries, and produce technical documents and newsletters to keep our members informed and up-to-date on the latest developments in the industry.

At WEI-IEO, we are committed to building a stronger, more sustainable, and more innovative wood preservation industry, and we welcome all companies and organizations that share our vision to join us as members. By working together, we can promote the responsible and sustainable use of wood as a building material, and help create a better world for future generations.

Further reading in this section


The European Institute for Wood Preservation, WEI-IEO is an industry organization that serves as a hub for the European wood ... Read More


Welcome to the WEI-IEO public file archive! Our online platform provides a wealth of information on WEI-IEO, including research reports, ... Read More

In pursuit of excellence

Prior to being accepted into membership, WEI members have to subscribe to the ‘Charter for Professional Wood Preservers’. This charter ... Read More

Wood – Building The Bioeconomy

Wood – A vital resource for the planet Throughout human history, wood has provided us with a diverse, versatile, durable ... Read More

Treated wood – a sustainable choice

A construction material, provided and renewable by Nature, with predictable performance, taking carbon from the atmosphere and locking it away ... Read More

Join the WEI-IEO

Join the WEI-IEO community and be a part of the wood processing industry that creates durable and long-lasting wood products ... Read More

WEI Member benefits

As a member of the European industry trade association representing the treated wood industry (WEI), you can enjoy a variety ... Read More

Who Can Join

WEI-IEO welcomes all businesses, organizations and persons involved in the production, processing, and distribution of treated wood products in Europe ... Read More

How to Join

Companies or individuals interested in joining WEI are requested to complete the application form and to send it to the ... Read More