Damp patch!!

[Daveiom]

Hello

I have recently bought a period property and have had a new roof and the whole third floor re-plastered. However this damp patch has appeared over the last few days, so I have put a dehumidifier in the room to see if that helps.

So I am wondering is it condensation because this is an external wall or is it penetrating damp?? It’s only appeared in the last two days!

Any help or advice would be appreciated

 

[sircerebus666]

If that slope in the corner is because of your roof then your roof is leaking , have you had any heavy rain recently ?

Is that a chimney breast I'm seeing? Have you checked the flashing around it if it is?

Just to clarify you have no water pipes above that damp patch?