Durability of wood and wood-based products - Preservative-treated solid wood - Part 1: Classification of preservative penetration and retention

This technical specification establishes a systematic framework for evaluating the durability of solid timber subjected to preservative treatment. It specifically focuses on the classification of preservative retention and penetration levels within wood products, providing essential criteria for ensuring long-term performance in various service environments. The document outlines detailed methodologies for assessing how effectively preservative solutions penetrate timber sections, which is critical for determining the protective capacity against biological degradation. By defining specific classes for retention amounts and penetration depths, the standard facilitates consistent communication among producers, treatment facilities, and end-users regarding the quality of treated wood. These classifications help in selecting appropriate wood protection levels based on intended use and exposure conditions, thereby supporting the reliable application of timber in construction and other applications where durability is a primary concern. The guidelines presented assist stakeholders in verifying that treatment processes meet defined performance requirements, contributing to the overall reliability and safety of timber structures.