Short answer
A damp band at the foot of a wall is often linked to rising damp. It should be analyzed together with the building's other signs before treatment.
What the band shows
The band indicates an area where moisture migrates and then evaporates.
It may show a white edge linked to hygroscopic salts.
Why measure and observe
The height, regularity, and evolution of the band provide useful clues.
Dated photos help prepare the discussion with MURSAIN.
Do the marks keep coming back despite cleaning?
That is often a sign that the cause needs analysing, not just the surface.
Possible treatment
If rising damp is confirmed, HYGRO may be considered after diagnosis.
If another cause is dominant, another solution may be more suitable.
Frequently asked questions
Is a damp band always linked to rising damp?
It is a common cause, but a diagnosis can confirm it and distinguish other origins.
Can the damp band change in height?
Yes. Its height may vary with the seasons, rainfall, and the condition of the building. Documenting its evolution is useful.