woodsmith
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Hi Carolyn, sounds like the wood has been wet, rotted then dried out leaving it pale and crumbly. "Dry rot" is a bit of a misleading term as the fungus needs high levels of moisture to flourish.
You need to cut out all the soft and wet timber, give it a good soaking in wood treatment, let it dry then fill using a two part filler.
It would also be a good idea to see if there is any obvious reason why the wood has got so wet, is the mastic missing for instance?
Keith
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