Some wet rots are termed as 'brown rot': Here, you can see the shrinking and splitting of the timber causing cuboidal cracking. The wood is also darker after the metabolism of lignin.
Other types of wet rot are termed white rots which cause the timber to become fibrous and lighter in colour.
What causes wet rot?
In common with all fungi, wet rot requires moisture for germination to take place and to sustain life. So as with all wood rotting fungi the primary cause of wet rot is moisture. If wood is kept 'dry' - below 18% moisture content - it will not decay.
How do you treat wet rot?
The first step is to remove the source of moisture. All decayed timbers should be replaced with pretreated timber, or wherever possible, a material not susceptible to wet rot i.e. concrete (lintels etc).
Can rot return after treatment?
Both wet and dry rot can return after successful treatment. Contractors can sterilise, treat and replace affected areas to eradicate any decay present, however if the necessary conditions reoccur, the rot will start again.
Spores are always present in the air and the only way to prevent wet rot and dry rot is to control the conditions.