Modelling the Material Resistance of Wood-Part 3: Relative Resistance in above- and in-Ground Situations-Results of a Global Survey

Durability-based designs with timber require reliable information about the wood properties and how they affect its performance under variable exposure conditions. This study aimed at utilizing a material resistance model (Part 2 of this publication) based on a dose-response approach for predicting the relative decay rates in above-ground situations. Laboratory and field test data were, for the first time, surveyed globally and used to determine material-specific resistance dose values, which were correlated to decay rates. In addition, laboratory indicators were used to adapt the material resistance model to in-ground exposure. The relationship between decay rates in- and above-ground, the predictive power of laboratory indicators to predict such decay rates, and a method for implementing both in a service life prediction tool, were established based on 195 hardwoods, 29 softwoods, 19 modified timbers, and 41 preservative-treated timbers.

Automated summary

This study focused on durability-based designs with timber and utilized a material resistance model to predict decay rates in above-ground situations. The research surveyed laboratory and field test data globally to establish material-specific resistance dose values and adapt the model to in-ground exposure. The study demonstrated the relationship between decay rates in- and above-ground, the predictive power of laboratory indicators, and a method for incorporating these findings into a service life prediction tool.