Certification in the wood preservation sector

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Posts, stakes, poles

Round or hewn timber, generally pointed. They are intended for putting in the ground for various uses as fencing, signs, vineyards, arboriculture, etc.

These products are easy, quick and economical to install.

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As they installed in the ground, these timbers are use class 4. Used in this way, they are reliable in terms of use and recommendations. Expected durability varies according to usage. For the specific treatment of vineyard and arboriculture posts, the retention required by CTB-B+ certification is retention 4 (SP), a value that enables a service life of over 15 years to be reached.

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the durability of these works. To ensure their durability, ensure to:
• prohibit any machining after treatment. However, for cuts and holes above ground, the exposed surfaces should be treated with a suitable product to help rebuild the initial level of protection
• implement drainage adapted to the base if the embedded part has been cast in concrete

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CTB-B+ treated timber does require the application of any additional products to ensure durability. Mechanical damage should be treated in the same way as holes and sections, using a product appropriate for that purpose.

In accordance with standard NFB 50-105-3, it is not possible to use refractory tree species (spruce) in use class 4.

Universal use classes, specifications of different treatments :

Before choosing the timber species, please refer to the use class. Identical in every country, the uses classes define the situation of the timber in a particular structure. They do not, however, attest to its suitability for use. For the same use class, the treatment requirements may vary from country to country. Each species has its own characteristics in terms of natural durability (before treatment) and impregnability (capacity to retain the product). The allocation of a species to a use class determines how the timber should be treated. Its effectiveness depends on the selection of the timber, the quality and quantity of the product used and how the process is managed and controlled.
Tableau des classes d'emploi du bois 4
Schéma utilisation du bois dans l'emploi agricole

Fiche technique pour bien comprendre les classes d'emploi des bois



To help professionals make the right choices, holders of the CTB-B+ Mark publish a brochure entitled
« Fully understanding the classes of use ».

Download Fully understanding the classes of use