CLT - L n° 5048

Reference: 5048

Protection formulée à partir de matières premières majoritairement minérales et végétales pour panneaux de CLT. Composition contrôlée par le laboratoire "EPH".

L’objectif d’un traitement de surface des panneaux de CLT (Cross Laminated Timber) destiné à un usage intérieur est généralement de préserver l’aspect naturel du bois, de faciliter le nettoyage et de les protéger contre la saleté et l’humidité.

Les meilleurs choix pour les panneaux de CLT d’intérieur sont des produits perméables à la vapeur d’eau, qui laissent le bois respirer, ce qui contribue à un bon climat intérieur.

À l’intérieur, pour empêcher les panneaux CLT de jaunir avec le temps, il est recommandé d’utiliser une huile de protection naturelle blanche ou le « CLT-L » qui permettra de conserver l’aspect clair du bois

€185.50

Tax included

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Properties :

Protection du CLT sans altérer son esthétique

Amélioration de la luminosité des surfaces bois

Produit adapté aux projets orientés qualité de l’air intérieur

Application rapide = gain de temps sur chantier

Additional details

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Technical specifications

Type of surface :: Porous wood
Yield :
Layer :: 1
Dilution :
Drying time :: 2 hours at 20°
Tool cleaning :: With water
Packaging :: Metal
Shelf life :: 1until 2 years

Specific References

Frequently asked questions

For questions about a product, could you please consult its technical data sheet before contacting us?

Find out more

What is a CLT building?

Cross-laminated timber (CLT) – or CLT elements – refers to solid timber components made up of layers of boards glued together in a criss-cross pattern, which are often used as load-bearing structures in the walls, floors and roofs of single-storey or multi-storey buildings. They offer high strength in relation to their weight, but CLT elements are also a moisture-sensitive material, a factor that must be taken into account right from the design stage.

Why is it necessary to treat CLT panels?

Building with CLT panels is becoming increasingly popular, but CLT panels are sensitive to moisture. The treatment of CLT (cross-laminated timber) panels for interior use is primarily necessary to protect the material from moisture during the construction phase, ensure its dimensional stability, prevent damage and achieve the desired aesthetic appearance.

CLT is a hygroscopic and vapour-permeable material, which means it absorbs and releases moisture depending on its environment.

What kind of damage can CLT panels sustain?

Damage to CLT elements can result, in particular, in significant mould and rot growth, as well as the formation of cracks leading to leaks in the air and vapour barrier. This damage leads, for both types of components, to a deterioration in the indoor climate and has been observed – following the incorrect handling of CLT components – in vulnerable damp rooms and unsecured installations.

What should the humidity content of a CLT panel be?

CLT elements are generally delivered from the factory with a moisture content of 12% – plus or minus two per cent. This is significantly higher than the moisture content under winter conditions, when the wood’s moisture content is expected to be around 8% once it has reached equilibrium with the indoor climate. It is this difference in moisture content that causes drying and, consequently, shrinkage. A slight presence of shrinkage cracks on the surface of CLT elements is generally to be expected.

As CLT elements are sensitive to moisture, it is recommended that the precautions applicable to traditional timber construction be followed. The client or their consultant must draw up a moisture management plan detailing the handling of the elements from the factory through to the completion of the building.

Here are the main reasons for treating CLT indoors:

Protection against moisture and damage: CLT components are sensitive to moisture, particularly during transport, storage and assembly. Moisture can lead to the growth of mould and fungi, as well as dimensional changes in the timber. This is why a temporary protective coating (such as ‘wet guard’) is often applied to surfaces to prevent water ingress until the building is enclosed.

Prevention of shrinkage cracks: As wood dries, it shrinks. If CLT panels are installed whilst they have a high moisture content and then dry in a heated indoor environment, cracks may appear. A surface treatment can help to control this process.

Air-tightness and stability: To ensure the building is airtight and to prevent noise caused by cracks, it is important to treat the joints correctly.

Aesthetics and finish: If CLT panels are to be left exposed (in residential architecture), they are often treated to preserve the appearance of the wood, protect against stains and ensure a uniform surface.

Vapour-permeable surface: it is recommended to use vapour-permeable treatments (e.g. paint or oil) so that the wood can continue to ‘breathe’ and regulate the room’s humidity balance.

Consequences of a lack of treatment:

If CLT is not adequately protected, this can lead to costly repairs, damp patches on interior surfaces and structural problems caused by the movement of the timber.

What are the key points to consider when treating a CLT panel:

Vapour permeability: Ensure that the product is vapour-permeable, particularly if the CLT panel forms part of a vapour-permeable wall construction.
Indoor climate: Choose products with low VOC (volatile organic compound) emissions to ensure a healthy indoor climate.
Application: Follow the supplier’s instructions carefully and do not hesitate to test the product first on a small, inconspicuous area.
For untreated surfaces indoors, where there is no risk of exposure to moisture, treatment is not technically necessary, but it is recommended to facilitate cleaning

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