Hi,
I have a damp patch on the interior wall situated 2 metres up from floor level. The internal wall shows no other signs of damp. The house is a mid terraced house built in 1899. The rear exterior wall shows signs of salts bubbling through the cement render/masonry paint. The damp patch is situated on the interior wall between the door access to the kitchen and the ground floor window. The interior wall on which the damp patch is located on what would have originally been the external wall but the kitchen extension wall (kitchen extension single brick erected circa 1970's) incorporates this section of the exterior wall making it an interior wall and not subject to direct weathering. I don't know whether this damp patch would be classed as "rising damp" or "penetrating damp" possibly from a loose roof tile or a crack in the external wall. Is there anyone here who could advise me please on how to eradicate this damp patch? (photos attached)