Certification in the wood preservation sector

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Outdoor development projects that fit out places (playgrounds, street furniture, etc.), make them more attractive and delimit or facilitate access to public or private spaces.

Logo performances des bois certifiés CTB-B+


The products involved are round
timber, unplaned or planed sawn
timber for use in use class 3.2 to 4.
Given the duration of service
and contact with the public, it is
recommended to use CTB-B+
treated timber for use class 4.

Logo pose des bois certifiés CTB-B+


CTB-B+ treated timber ensures
the durability of these strustures.
It should however :
• avoid water traps
• 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.

Logo entretien des bois certifiés CTB-B+


CTB-B+ treated timber does
require the application of any
additional products to ensure
It should be maintained by cleaning
using a brush and/or water jet (high pressure prohibited).

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

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