We conducted a preliminary investigation to determine if soaking high-temperature plywood in a low-temperature preservative solution could achieve deeper penetration of the preservative, even in plywood made with refractory wood species such as Japanese larch. Specimens cut from commercial plywood (Japanese larch) were stored at various temperatures before being soaked in the preservative solution. The uptake, penetration, and retention of the preservatives were then analyzed. The results showed that solution uptake tended to increase with increasing specimen temperature. The penetration of air-dried specimens was an average of 55%, while for specimens with low moisture and those stored at 40-100°C, it was nearly 90%. Increasing the temperature of the plywood immediately before soaking led to an increase in the retention of all layers, including the inner layer. Antifungal performance was evaluated using a sand-block laboratory test with Fomitopsis palustris and Trametes versicolor. It was confirmed that sufficient antifungal performance could be achieved by soaking the specimens in a state above a certain temperature.

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