The first thing homeowners look for when discovering signs of damp is a damp proofing solution. They find their peeling wallpaper or black spores and set about treating the damp itself. However, the visible signs of damp are usually the symptom of an underlying issue, not the cause of the problem.
Without understanding what causes the damp before treating it is fighting blind. It will result in wasted money and likely will see the damp return. It’s important to know what caused it in the first place.