Durability of wood and wood-based products - Use classes: definitions, application to solid wood and wood-based products

This standard establishes a comprehensive classification system for the natural durability of wood and its manufactured products. It defines specific usage classes based on the intended application environment and the expected exposure to biological decay factors, such as moisture, fungi, and insects. The document provides clear criteria for categorizing materials into distinct performance groups, ranging from indoor applications with low risk of decay to outdoor situations involving permanent contact with the ground or seawater. These definitions are designed to assist architects, engineers, timber traders, and regulatory bodies in selecting appropriate wood materials for construction and manufacturing projects. By aligning with international technical specifications, this framework ensures consistency in durability assessment across different regions. The guidelines facilitate the proper specification of timber products to achieve desired service life expectations while promoting sustainable resource use. It serves as a foundational reference for evaluating the performance of solid wood and engineered wood products under various environmental conditions, supporting informed decision-making in the design and construction phases without altering the inherent technical requirements of the material.