Mould on bathroom wall!

[Jezabelle]

There is mould all over my bathroom wall! We have cleaned it off and repainted but it doesn't take long to return. Luckily it doesn't smell of damp in there. We live in an old, stone walled house. We have installed under-floor heating in the bathroom and have an electric extractor fan.

Do I just need to use a mould spray each time it comes back? I'm not sure what else we can do to stop this problem recurring!

do you have a window to leave open for ventilation? Does the extractor work properly?

Do you use anti-mould paint?

Have never heard of anti-mould paint! Will look into it.
The extractor may potentially be a little small for the bathroom, but we can't afford to get a new one and pay an electrician to install at the moment. Perhaps I should leave the window open. Thing is, it can get cold and make under-floor heating a bit of a waste of money. But I will try to do this during the day whilst we're out. Thanks for the input.

as it is stone, the walls will tend to be cold which encourages condensation.

You can run a typical bathroom extractor for 50 hours on 12p worth of electricity, so run it during and after every bath and shower until the room is throughly dry. As you already have a wet problem, leave it running permanently for now. If it is noisy, the bearings are worn out, so buy a new one, preferably with a ball-bearing motor.

If your fan is ineffective, it may be a weak one (the minimum power is usually about 80 cu m per hour nominal) or the motor may be clogged with dirt, ort the duct may be blockedwith cobwebs. Find someone who smokes and watch to see if smoke is visibly sucked away by the fan.

A bathroom fan works best when the door and window are shut and it can draw in warm dry air from the rest of the house through the gap under the bathroom door.

Look for any signs of a water leak, especially under the bath, as this will add to the dampness.

I wouldnt leave the window open all the time but a few times a day especially after showering/bathing should help

or disregard what I have said and read the above instead!