What is the moisture content threshold for wood considered safe to prevent rot?

The moisture content threshold for wood to be considered safe from rot is typically around 20%. When wood maintains a moisture content below this level, it is less susceptible to fungal growth, which is necessary for rot to occur.

Wood with a moisture content above 20% creates an environment conducive to rot, as higher moisture levels allow fungi to thrive. Keeping wood below this threshold is essential for preserving its integrity and preventing decay, especially in conditions where wood is exposed to humidity or moisture.

While moisture content levels of 15% and 18% are also relatively safe, they are not as universally recognized as the 20% level for critical applications. Levels at or below 20% are what is most commonly referenced in standards to protect wood from potential decay. It is also worth noting that continuously monitoring and managing moisture levels in wood is essential in maintaining its longevity.