Roof Terrace Forum Confluentes, City of Koblenz, Germany


Wood is a sustainable and re-growing building material. It has a lot of advantages compared to other materials. It is light, but still rigid and stiff. It is flexible and elastic and resistant against impacts of all kinds. It is easy to be treated and can be brought in all forms you can imagine. But there is one disadvantage, wood is not weatherproof. Wind and rain and strong solar radiation combined with a huge temperature range can speed up the ageing process of wood tremendously. With its worldwide unique technology ASSYX has found the solution to make wood weatherproof. ASSYX DuroCONSTRUCT; building elements combine all the advantages of Kerto-Q LVL-products with Polyurethane plastic material. Polyurethane is a duroplastic polymer material which is weather-proof and uv-resistant under a wide temperature range. ASSYX uses Kerto-Q-LVL and coats it inseparable with Polyurethane. An ingenious combination of wood and polyurethane: As light as wood but nevertheless as durable as steel. The optimal building material for all outdoor applications that can be made of wood, f. i. like flooring for roof terraces.

Key benefit

Material list

Approx. 1000 pcs. Kerto-Q elements 1985x568x44 mm

Approx. 10 tons Polyurehtane material of type Baydur (is a registered trademark of Covestro AG)

Ecological values



  • Economical span (mm)
  • Thickness (mm)
  • Airbourne sound reduction factor (dB)
  • Impact sound transmission (dB)
  • Resistance to fire class
  • Thermal properties



  • Coating LVL is very good idea and increases its weather resistance significantly. Combining with modular sizes it allows to build fast large even large terraces.
  • This is a really good application of engineered wood: Having a very light core and a very robust skin. It would be useful to know the sizes of boards available.
  • Thank you for your contribution. The question of a suitable coating for long-term use of LVL products outdoors or in damp areas is a recurrent topic. It is very good to know that you publish your production and performance capabilities to create a solution even for special requirements.


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