DIY Doctor

Main navigation

Mould/damp on bedroom external wall

Postby bevm » Sun Oct 14, 2007 2:23 pm

Help. I have black spots of mould appearing on the wall under my bedroom bay window. The wall is decorated with blown vynyl and emulsion and the paper is beginning to lift. The right hand side of the bay is virtually clear and the worst spot is the left hand side.
These black spots are also on the paster underneath and and the windows which are upvc double glazed.
My husband has sealed under the window sill and he tells me there are no tiles etc missing on the outside.
I do have floor length curtains at the window but the top small window is left open all day although not at night as we live on a main road.
I do tend to have washing on the radiator sometimes so could it be caused by condensation?
How do I get rid of it?
How do I stop it reoccurring?
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Sun Oct 14, 2007 2:13 pm


Simply Build It

Postby stew » Wed Nov 07, 2007 9:56 pm

sounds like a ventalition problem to me the clothes dont help on the rad
the long curtains restrict the flow of air behind them.
Rank: Apprentice
Progress to next rank:
Posts: 8
Joined: Sat Nov 03, 2007 8:31 pm

Postby matheus » Thu Nov 08, 2007 3:41 pm

You have a condensation problem. The spots of black mould are called superficial mould growth.

The reason the mould is collecting is because this area of the wall is probably the coldest, therefore creating a cold wall surface. It is more noticeable during this time of the year as it is colder, and we are far more less likely to ventilate rooms as opposed to the summer time. You have probably noticed this?

The drying of clothes is normally a large contributory factor, as you have increased the moisture within the room. You should dry the clothes elsewhere, preferably ventilated.

You should also try and ventilate the rooom as well. You may find the UPVC windows have trickle vents integrated into the frame on sliders. You may also find that the UPVC windows do not have any trickle vents are also adding to the lack of ventilation!

A little bit more information on the type of property would be helpful. What is the age of the property, is it a bungalow. ie is it a ground floor wall or first floor? Is the wall cavity construction or solid?
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Thu Nov 08, 2007 3:21 pm

Postby thedoctor » Thu Nov 08, 2007 10:05 pm

See our project on condensation on the website
Posts: 2525
Joined: Sat Apr 08, 2006 12:15 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics