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Got photos of the exterior / interior?
Painting the external walls seals damp in so it tries to get out via the inside surface.
Materials like concrete are porous and will allow moisture to travel into adjoining surfaces.
Modern plasters trap moisture in brickwork until there's enough to pop the plaster off the wall etc...
Howard
we have a lower ground floor where there is damage to the walls from water somehow getting in. we have had this problem for ages and first tried to fix it by getting the steps leading to the upper ground floor re-ashpalted. when we redecorated after that the problem reappeared. we have since had the external wall repainted and tried adding sealant in a suspicious area next to the steps but there is still some dampness in the walls.
i've always avoided the damp survey companies that give out do free surveys because i've been told that they are cowboys that will find lots of "problems" that they can expensively fix but someone told me recently that it's possible to trace where the water is coming from with some sort of camera scan. does anyone know any experience of this? any recommended companies?