Damp and black mould along window frame

[damp_desperado]

Hi all - I wonder if anyone can help advise on these black spots along the window panes.. it looks like mould to me.. Does anyone have experience of this - do the windows need replacing or is it just a case of replacing the seal? Does this suggest a problem with ventilation? Thanks for any advice, really appreciate any help!

 

[Swwils]

Can you provide some more detail about the construction or a little history that you know about, is this a replacement window?

And a photo from the outside.

Ventilation will always help with condensation / mold issues, but it might not solve this one.

 

[damp_desperado]

Thank you for the response. I’m not sure on history, this is in a flat that I am exchanging contracts on on Monday! And just inspected for first time since tenants left.

I don’t think the mould was there when we last looked about 2-3 months ago, I think it’s built up over winter and looks like vent has been closed which is why I was hoping this was the issue.

No photos of the outside of the building unfortunately. Is there anything to suggest this could be more than a ventilation / condensation issue from the limited information available?

thank you very much for your help

 

[Swwils]

Sounds like you have found the issue.

It would be worthwhile to check the status of the outer perimeter sealant maybe at a more accessible window.

 

[damp_desperado]

That's great - thank you for the helpful tip, will make sure to do that once in the property next week.

 

[JP_]

And attack it with Cillit Bang Black Mould Remover

Keeping the room warm, and trickle vents open, should ward off mould. And always using extractor fan in bathroom & kitchen - moist air gets into all rooms in a flat very quickly