Wet rot is a type of wood decay caused by excessive moisture, typically resulting from water leaks or poor ventilation. It is primarily caused by specific fungi that thrive in damp conditions, breaking down the cellulose in wood and weakening its structure. Common signs of wet rot include dark, discolored wood, a musty smell, and a spongy texture. To prevent wet rot, it is essential to control moisture levels in buildings. This can be achieved through proper drainage, regular maintenance of roofs and gutters, and ensuring adequate airflow in areas like attics and basements. Addressing these issues can help protect structures from damage caused by fungi and wood decay.