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The majority of the wall is dry i.e. pale pink but there are these darker patches. i wouldn't say that they are chocolate brown more like a good tan with a bit of sunburn if that makes sense. I have painted over these areas with a watered down mix of matt emulsion and initially this stayed...

I was told by the plasterer that an external airbrick would help the building breath as tnher exterior face of this has effectively been sealed by paint and concrete. Right or Wrong?

Some more points to answer. The wall was rendered and plastered on the inside not outside but the wall in question has an exterior face if you see what i mean. The exterior of this wall is unrendered but has been repointed and painted. This i have been told will restrict the old red bri cks...

To answer other questions, the wall has a cavity i beleive and there is an external air brick. I also watched the plasterer at work and as it is only a small wall in a box room I know that he used the one bag of plaster so I'm sure that they are caused by damp. Thanks again

Thanks for the feedback everyone. The room is on the first floor and the patches are at various heights one is low under a window, one around waist height and the other around head height. The window isn't leaking and is a newish UPVC. The roof was leaking but has been fixed and this was the...

Hi, we had a wall re-rendered and platered about 2 months ago and there are still some quite large damp patches in the plaster. The house is an old brick terrace and the wall in question is an exterior wall that has been painted and repointed with concrete which I understand from the plasterer...