In this study, rated plywood, oriented strand board (OSB), laminated strand lumber (LSL), and laminated veneer lumber (LVL) were thermally modified as a post-treatment at 140 °C, 150 °C, 160 °C, 170 °C, and 180 °C using a closed, pressurized treatment method. Eastern larch OSB manufactured from heartwood and sapwood was also thermally modified as a post-treatment at 160 °C and 180°C. All specimens were subjected to laboratory soil block durability tests according to American Wood Protection Association (AWPA) E10-12 utilizing G. trabeum (brown rot) and T. versicolor (white rot) fungi.

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