Slight damp in poor circulating area

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Hertfordshire
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I have minimal levels of damp in one corner of the front room (bay window, front of house on external wall).

I've moved furniture and curtains as much as possible but I think the area will always suffer so I'd like to try something a little better.

What's the least intrusive method for fixing this? I want to try and avoid re-plastering and limit it to patching-up.

I considered something like a hit and miss vent but they all seem like big holes to punch through the wall.

Would drilling a few holes and finding a tidy way to cover be worth it?
 
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What sort of damp? Black mould damp or yellow and white stain damp?
 
Could be caused by a leak or by condensation.. Sort that first, or any remedial works will be temporary
 
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I know the cause, it's the external wall with poorly circulating air.

By drilling holes through the wall and covering with a grille, is this likely to resolve the issue?
 
How do you know now if you didn't know on sunday?

The cause of the "damp" has not been nailed down, it could be a mixture of rising damp, penetrating damp or most likely, as above, condensation.

Why not post pics of the outside & the inside of the wall.
 
Installing a vent could possibly make it worse. sounds like condensation on a cold wall to me.
 
I'll get some pictures - what in particular would help establish the issue? Just a couple of shots to indicate the construction and area?


I'm pretty sure it's poor circulation: corner of the ground floor, front bay window, slate DPC with a solid wall. Property built 1916. Happily take advice on it and being wrong though.
 
Just stick some polystyrene paper on it. It'll cure the problem.
 
No.
Its condensation on a cold wall, a vent will make the wall colder.

You can try what joe suggested.
 

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