At what moisture content does severe wood decay occur with wood decay fungi?

Severe wood decay due to wood decay fungi typically occurs when the moisture content of the wood reaches 20% or greater. This moisture level provides an optimal environment for the growth and activity of fungi that lead to wood decay. Fungi require a certain level of moisture to thrive, as it assists their cellular processes and enables them to break down the cellulose and lignin in wood, which are critical components of its structure.

Moisture contents below 20% are generally considered too low to support the growth of most decay fungi, thereby significantly reducing the risk of wood decay. Understanding this threshold is crucial for proper inspection and management of structures to prevent damage caused by these organisms. This knowledge is particularly relevant in the context of termite-related treatments and general wood maintenance, where controlling moisture levels is essential for preserving the integrity of wooden structures.