Dampness in older buildings is frequently attributed to a single cause when the underlying mechanism may be more complex. Building age, construction type, ventilation, heating patterns, external defects and previous repairs can all influence the condition observed.

Effective diagnosis therefore requires more than identifying visible staining or taking isolated moisture readings. The investigation should consider how the building was constructed, how moisture is entering or being generated and whether previous alterations have changed the way the building performs.

Remedial works should follow diagnosis rather than precede it. Treating the symptom without understanding the cause can result in unnecessary work and, in some cases, make the underlying problem worse.