About WTT

Specialists in technology for industrial wood and timber treatment

WTT is a unique company for several reasons.

WTT is the only company fully dedicated to and specialized in the wood industry with a full portfolio of both mainstream and niche wood treatment technologies. Each solution suitable for you is presented under our Products page.

This makes WTT not only a technology provider, but also a trusted partner in R&D, offering both a deep in-house know-how and access to an exclusive network of leading wood industry players including sawmills and other manufacturers, suppliers, researchers and industrial bodies. See our references here.

WTT continues its tradition for developing advanced treatment technologies. Would you like to read more of our newest technology developments? Click here or contact us directly.

Our mission and vision


At WTT, our mission is to provide first class, innovative wood treatment technologies for any species of wood in any area of final use anywhere in the world.

Vision – On the pursuit of excellence

Our vision is to expand our markets and become a global organisation, delivering large capacity plants just in time, at the highest level of excellence.

Our values

See all our news for WTT here

History and Ownership

Leading the industry for 40 years

The Danish Wood Treating Company, DWT, was founded in 1977 in Denmark as a spin-off from a large creosote treating company founded in 1838.

The founder, Niels Moldrup, had a degree in forest science, but he was also interested in engineering and started designing wood treating vessels.

The designs were very innovative and successful, and so led to the start of DWT as an independent technology provider for the timber industry.

During the years DWT changed its focus and structure on a long journey and has traded under brands such as IWT and Iwotech also.

You will find these names on our older plants from 1980-2000. Since 2003 we have been WTT – Wood Treatment Technology.

More than 1100 references worldwide

Over the years, WTT has supplied and serviced more than 1100 plants in over 40 countries within different wood treatment technologies. These numbers make WTT by far the most experienced and specialized supplier of wood treatment technology globally. See our references.


The ownership is held by Peter Klaas, who owns 100 % of the shares and runs the company on a daily basis as managing director.


Sustainability as a concept was developed and understood several hundred years ago by foresters who acknowledged that if you have rotation ages in a tree stand of a hundred years, several generations would need to look after that stand before anyone could harvest it.

Every year you can take out a small volume of timber as long as the natural increment is higher. If you clear-fell an area you would need to replant it, if the forest was to remain sustainable.

Wood is a sustainable building material provided it is grown in a regenerating forest eco system and used wisely according to its properties. The energy that goes into producing and transporting wood is very competitive towards other materials.


The sun, rain, CO2 from the air, and nutrition from the ground, is all it takes to make wood.

A key factor in building with wood is the service life. The longer a wood product is in service, the longer the carbon from CO2 is stored.

Sustainability is in focus in all WTT processes. We design timber treatment facilities that can increase the service life of a given wood commodity ten-fold or more compared to untreated wood.

Using modified or preservative treated wood is a sustainable choice