On 17/07/2019 15:40, newshound wrote:
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?

rising damp only rises about three feet but there could be no vertical
or failed cavity dpc at the cavity closure at the door opening..