Methods for wood preservation treatment of large materials such as Cross Laminated Timber (CLT) are limited. It is unclear which wood preservation treatment methods can effectively protect CLT from rot risk. In this study, accelerated rot tests (fungus cellar test) of CLT treated with the solvent-borne wood preservative by non-pressure treatment, named ‘deep penetration treatment’, were conducted to evaluate those of the rot performance. In addition, by evaluating the rot risk of the characteristic parts of CLT material, we evaluated whether CLT is easier to rot than other materials. The study of the wood properties of CLT contributes to the study of more effective wood preservation methods. The ‘deep penetration treatment’ of this study has a penetration range more than surface treatment and less than pressure treatment. Since visual observation from the outside is not sufficient to know whether the inner layer of the CLT is protected by the barrier layer of the preservative, internal analysis methods including non-destructive X-ray CT analysis were also examined. Within the range of this study, no rot was observed in the inner layer of CLT, confirming that the barrier layer of the preservative worked effectively.

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