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Timber is resistant to decay provided it remains dry. Inadequate ventilation and prolonged wetting as a result of, for example, faulty rainwater goods, rising damp, plumbing leaks or poor maintenance diminishes this resistance, although the vulnerability varies between timber species. There are numerous wet rots some of which are white rots and some of which are brown rots. There are many fungal species causing wet rot, some such as Fibroporia vaillantii attack softwoods others, such as Donkiporia expansa will attack hardwoods whilst other wet rots such as Coniophora Puteana can attack both. The same remedial measures however are required for them all.
The True Dry Rot Fungus, Serpula lacymans, (formally Merulius lacrymans) is a brown rot which attacks mainly softwoods and is significant for its ability to grow over inert surfaces and spread extensively behind plaster and through wall surfaces. Once established dry rot can quiclky cause structural collapse making correct diagnosis imperative.
DRY ROT TO SUB-FLOOR TIMBERS