An important parameter in determining the fire performance of CLT is its charring rate. The aim of this research is to measure the charring rate of CLT by conducting a series of experiments in an intermediate-scale fire resistance furnace under ISO 834 conditions. The char rate was measured using implanted thermocouples to track the progression of the char layer through the sample, giving a char rate of 0.83 ± 0.20 mm/min. A second measure of the char rate was obtained by removing the char layer after the experiment and manually measuring the decrease in cross-sectional depth. This technique measured the char rate of CLT to be 0.83 ± 0.11 mm/min. Care should be taken in applying these results in a design context and it is recommended that full-scale furnace testing under standard fire conditions be undertaken to assess whether the char behaviour observed during this research is applicable to larger panels of CLT.
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