Architects love CLT… and so do wood-boring insects and termites!

CLT (Cross Laminated Timber) is a timber construction material. Cross-laminated panels are made from 3, 5 or 7 plies of dry wood planks. The boards are then assembled perpendicularly and glued together. Panels can be made to measure, making it a very popular material with builders.

The advantage of wood is that it is organic. It is a biosourced, renewable material and a carbon sink. Its biodegradability must be taken into account in the construction process: as with any construction material, the aim is to ensure that the material has a lasting function in the structure. To achieve this, it is essential to protect the CLT panels from xylophagous biological organisms which can irreversibly alter its mechanical strength.

Architects in favour of CLT panels ..

While CLT’s place in the construction market is well established in the United States, it is continuing to grow little by little in Europe, particularly in the DACH region (Denmark, Germany, Switzerland). Architects love it and include it in their building projects for several reasons:

• First and foremost, it is an ecological solution, as CLT emits only 180kg of CO2/m3 compared with over 500kg of CO2 /m3 for concrete.
• The mechanical performance of CLT s mechanical performance and lightness mean it can be installed quickly, and are much appreciated by builders.
• The ability to make bespoke panels allows greater creative freedom.

… wood-boring insects and termites also like CLT panels!

But while CLT panels are very popular with architects, builders and new homeowners, this European growth means that the treatment of the panels must not be neglected.

There is a biological risk, and preventive treatment with an appropriate insecticide and/or fungicide is necessary.

Wood-eating insects (ILX ) and termites can infest CLT panels if they are not properly treated. Capricorn beetles, furniture beetles, lyctus and termites are all pests that should be avoided at all costs to ensure the solidity and durability of a home’s structure.

ILX preventive treatment for CLT panels

The European regulations in force remain the same as for all construction timber. Non-durable species must be given durability if there is a risk of insects and damp.  CLT panels must therefore comply with European standard EN 335 on wood durability.

AXIL CLT SYSTEM is a product developed by Groupe Berkem to protect CLT panels against wood-boring insects and termites, as well as fungi, which are also a risk, while water repellent.