The EN 351 series helps in selecting a preservative treatment for solid wood products. It considers the intended service, regional or traditional European practices, and the use class conditions mentioned in EN 335 for the wood products. It also gives guidance on the classification of retention. These can be used as a basis for specifying preservative treatments for products.
EN 351-1 defines terminology to be used by the specifier when preparing a preservative treatment specification or product standard. It is not a treatment specification. It is applicable to the production of preservative-treated solid wood, including glued laminated timber, suitable for use in those service conditions defined within the use classes in EN 335. It does not apply to any subsequent examination of treated wood in service.
EN 351-1 is applicable to the protection of wood against attack by wood-destroying and wood-disfiguring fungi, insects, and marine organisms. It does not consider other properties of treated wood, for example, odour, and compatibility with other materials, such as the corrosivity of fasteners. Nor does it consider any properties from the health, safety and environmental point of view.
It does not apply to wood to be treated with formulations which are applied to timber in service to eliminate or control an existing fungal or insect infestation, or the prevention of attack by sapstain fungi, or insects in green timber.
The main changes compared to the previous edition are:
— a new penetration class has been introduced,
— optional requirement on longitudinal penetration has been deleted,
— compliance with penetration and retention requirements have been further elaborated.