Wall mushrooms - update

May take weeks to dry out.

Once rot is estsblished, drying out won't cure the commonest form. (Dry rot) It will need chemical treatment. Eg cuprinol five star.

I was told different, and the wikipedia article seems to back his up

'Once established, the fungi can remain active in timber with a moisture content of more than 20%'

So when moisture content drops to below 20% it should go dormant, how easy it is to get the moisture level this low is debatable, chemical treatment can give some respite in mean time

Martin

Depends on which rot you have got. It would not be neccessary to chemically treat it if that were not so. Timber commonly has more than 20% moisture in the UK even with no roof leaks. Your rot is still active even though roof is fixed

Look up "dormant."

Dry rot isn't the commonest form of timber decay in the UK and drying does, demonstrably kill it. It's a fungus, all fungi need water. Every last one. But we are not talking about dry rot.

Peziza (cellar cup) requires a lot of water and should be easy to dehydrate.

Have you tries 'tenting' the dehumidifier? They work best in confined spaces and enclosing them in polythene sheeting with the section of wall you are trying to dry would accelerate things.