Black Mould around UPVC Windows

[Ade Bridgway]

Hi

Looking for advice on how to troubleshoot black mould appearing around UPVC window frame in bedroom. This has appeared over the summer months. Teenager's room so a lot of time spent in there with door/curtains closed.
Leak or condensation issue. Thoughts?
Add a dehumidifier?

 

[Harry Bloomfield]

Condensation, ventilation needs to be improved.

 

[crank39]

Defo, long time spent in room breathing out water vapour(more if he's busy with a girlfriend), no ventilation, curtains drawn trapping air, door closed yep perfect recipe for condensation

 

[JP_]

Might need to check insulation above the ceiling - that's a lot of mould for a bedroom in summer/autumn. Maybe the walls are getting damp from the outside too?

The fact that most is on the ceiling suggests a cold spot in the insulation could be an issue.

Cillit Bang black mould remover will help get rid of it. Then once gone, do a vinegar soak as the acid helps kill mould spores.

I've insulated my bedrooms fully, but still get some black mould forming around the windows where I could not put insulation on the reveals.

Make sure trickle vents are open all the time, and open the window in the mornings if you can to help it dry out during the day.

 

[RandomGrinch]

Hi,

As above - the only thing I would add (and I may be wrong!) is that your window seems to be set quite far forward, close to the external wall.
This could cause cold bridging (it's possibly even installed in front of the cavity/cavity insulation?).

There's nothing much you can physically do to solve that, apart from taking everyones advice above

 

[RandomGrinch]

The fact that most is on the ceiling suggests a cold spot in the insulation could be an issue.

I'm afraid it looks like the mould is on the top of the reveal, rather than the ceiling