Wet rot (Coniophora Puteana) is the most common form of timber decay and can be found in most properties at some point and is typically confined to the area where buried and exposed timber has become and remains wet.
Firstly the cause of the water ingress should be identified and any structural problems should be treated. There is no point in repairing the damage to the timber if it is going to reappear because the cause has not been identified and treated.
If an outbreak of wet rot occurs in structural timbers (such as roof trusses, floor joists the implication for structural integrity must be established. In other areas, the rotten timbers should be removed and replaced; if the damaged area is fairly small, it can be cut away and a new piece of timber joined to that remaining.
If the damage is confined to a very small area, an epoxy based repair kit can be used to fill the damaged area once it has been cut back to sound timber and the new surface of the wood treated with a suitable primer. Preservative tablets are available which are inserted into the timber adjacent to the repaired area to protect the timber ‘from within’.
If there is any doubt that the structural problem has been eliminated, the new and adjoining timber should be treated with a proprietary wet rot treatment before redecorating. After repair exposed timbers should be treated to reduce the potential for ongoing issues.
External timbers should be protected with adequate coats of paint or some other suitable timber treatment/preservative.