The higher the moisture content within timber the higher the chance of wet rot.
The most common type of wet rot decay is usually caused by Coniophora puteana, which is found in some form in most properties. Another fairly common fungus is Poria vaillantil, although there are many other less common fungi that may also occur.
While each of the different fungi has its own individual features, the overall appearance and treatment of wet rot is similar. Wetrot is usually confined to the damp area because the mycelium does not spread into walls.
Wet rot is not as destructive as dry rot, but it can and does cause structural damage.