wrote:

Any advice for fungus growing on inner walls of a 1930's house? It is
at top of walls so I think not rising damp.

If I just re-paint will it re-occur? Is there any treatment I can give
before repainting to prevent recurrence?

When I moved in the house had to be re-wired and the electrician
fitted a ventilator from the upstairs WC to an outside wall, could the
cold air coming in through this be causing the damp/fungus and would
blocking it up be any use?

Do I need to keep the rooms affected heated? Better ventilated?...

Need to nail this down more. It could be caused by condensation
pr water ingress. Condensation could be caused by 4" wall,
inadequate ventilation, overoccupancy, or excess water vapour
generated elsewhere in the house. Water ingress usually means
faulty or blocked rainwater goods, roof, valley, or in some cases
window detailing. And there are other possibilities.

So more detail would help, as would a good look over the rainwater
goods and roof.


NT