Ground water can also contain small amounts of soluble salts including chlorides, nitrates and sulphates. These salts pass with the moisture up the wall and are left behind after the water evaporates as salt crystal within the plaster – now contaminated.

Over many years of active rising dampness large quantities of these salts accumulate within the masonry and decorative surface, with the concentration of these salts found towards the base of the wall.

Both chlorides and nitrates can absorb moisture from the surrounding environment and even though rising dampness may have been controlled by the insertion of a remedial damp-proof course these salts alone can cause the wall and any contaminated decorations to remain damp.

rising dampness

ground water
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