How does wood deteriorate?

Answer:
Moisture content is the critical factor that makes wood susceptible to decay. It must exceed 28%, and liquid water must be present in cell cavities before decay fungi can gain a toehold. Once established, some fungi can carry on their destruction at a moisture content as low as 20%. When moisture content falls below this level, all fungal activity stops. That's one reason why framing lumber is dried to 19% moisture content or less.
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