What is the primary method for controlling wood decay in structures?

Eliminating moisture sources is the primary method for controlling wood decay in structures because wood decay is fundamentally a result of excessive moisture exposure. Fungi, which are responsible for wood rot, require a certain level of moisture to thrive and reproduce. By addressing and managing moisture levels—such as repairing leaks, ensuring proper drainage, and reducing humidity—structures can significantly diminish the risk of wood decay and extend the longevity of wooden materials.

In contrast, while applying fungicides can provide temporary relief and protection against fungal growth, it does not address the underlying issue of moisture, which is crucial for effective long-term wood preservation. Similarly, using pressure-treated wood adds a layer of protection against decay but does not eliminate moisture sources that can still lead to deterioration. Ventilating crawl spaces can help reduce moisture levels to some degree, but it is only effective when combined with more comprehensive moisture management strategies. Hence, the most effective way to prevent wood decay is to eliminate the sources of moisture altogether.