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Most damp issues are related to thinks like gutter/pipe/tile/flashing leaks/inadequate ventilation that simply need fixing, or modern materials (cement instead of lime) being applied
This needs to be printed onto a length of 2x4.
[Edit] One other cause is DPCs being breached by new building work / building waste.
If you're buying a house >100 years old letalone 240 years (!) I'd recommend doing some reading on SPAB/Historic England/Cadw or whatever the equivalent is where you are, or buying the "old house handbook" or similar books
Most damp issues are related to thinks like gutter/pipe/tile/flashing leaks/inadequate ventilation that simply need fixing, or modern materials (cement instead of lime) being applied