Which risk increases when a Roman fort's timber palisade lacks regular creosote treatment in a humid environment?

💡 Explanation

Without creosote, timber in humid conditions is vulnerable to fungal decomposition because moisture fosters fungal growth which breaks down the wood's cellulose. Therefore accelerated rot results, rather than flammability, expansion, or infestation, which require separate triggering mechanisms related to fire, temperature fluctuations, or specific pests, respectively.

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