Might only be apparent if the person actually takes off the interior
finishes etc..
Brian

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"newshound" wrote in message
o.uk...
On 17/07/2019 15:06, Jim GM4DHJ ... wrote:
"Dan Green" wrote in message
...
Hi all,

Can anyone explain what kind of damp this is and what might be causing
it? There is nothing amiss or damaged on the outside of the building
that
could account for it so I'm at a complete loss as to what the underlying
problem could be. Here's a pic:


http://oi66.tinypic.com/1zzgvn4.jpg

Thanks.



cold surface condensation ......?


Perhaps, or common or garden rising damp but held back by an impervious
plaster, or plaster over tanked brickwork?