Black mould above window

[Marc Lee]

I've just stripped the wallpaper from the bedroom wall. Above the window is a patch of black mould / mildew.

On closer inspection I found there is an airbrick venting the cavity above the window. I suspect that driving rain gets blown into the cavity and has caused the damp.

My thoughts are to put a louvred vent over the airbrick to allow ventilation, but reduce water ingress.

I can then treat the mould and decorate.

Any other ideas?

TIA

[Alan]

It may have vented through to the room once...

[Tim Mitchell]

In article , Marc Lee writes

I think the air brick will be making the inner wall colder in that area, so condensation is forming and causing the mould to grow. I doubt that it will be water ingress.

You will probably need to get rid of the condensation, open your windows for half an hour each morning or something. Our house grows black mould at the slightest provocation if not well ventilated, usually high up in the corners of rooms with outside walls, but it's just condensation. I periodically attack it with thin bleach.

[Marc Lee]

Thanks for the advice Tim, sounds like the previous owners kept the windows closed! We have some smaller patches in wardrobe corners etc.

Marc