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Rising Damp · Diagnosis and guidance

Rising damp

Rising damp appears when moisture from the ground moves upward through porous building materials. It often affects lower wall areas, skirting zones and finishes near floor level, causing recurrent damage over time.

  • Typical signs in skirting areas and lower wall bands
  • Often associated with salts, flaking paint and damaged plaster
  • Requires a clear diagnosis before superficial repair work
Wall affected by rising damp

How to recognise it properly

Rising damp usually starts from the lower part of the wall and tends to follow a fairly recognisable pattern. It is different from condensation, which is linked to indoor air, and from localised water ingress, which usually comes from a specific entry point.

Typical sign

Skirting damage and salt deposits

Lower wall deterioration, salts, flaking paint and damp finishes near floor level are common indicators.

Common mistake

“It just needs repainting”

In many cases the finish is repaired, but the damage returns because the cause was never properly addressed.

Key point

Diagnosis comes first

Before acting, it is important to confirm whether the pattern really matches rising damp and not another moisture issue.

What usually makes the problem persist

Rising damp often becomes more visible over time when repairs focus only on the surface. Paint, plaster or decorative finishes may be replaced, but the lower wall continues to show signs of moisture and salts.

Surface repair

The visible finish is treated, not the cause

Cosmetic repair may improve appearance temporarily, but the wall can deteriorate again if the underlying moisture remains active.

Wall behaviour

Progressive damage in lower areas

The lower band of the wall is usually the first to show recurring paint damage, salts and plaster weakness.

Technical view

The pattern matters

Height of damage, salt formation and repeated appearance in the same lower areas help confirm the diagnosis.

What we do when it is rising damp

We first confirm that the case fits rising damp and not a different type of moisture problem. Then we define the appropriate technical path, which in this type of case is linked to the HUMIX System.

1) Diagnosis

We review salts, height of damage, skirting deterioration, repeated finish failure and the wall-ground relationship.

2) HUMIX System

When the case fits rising damp, the recommended technical path is based on the HUMIX System and a realistic drying strategy.

3) Progressive drying

The wall does not recover instantly. Drying and finish recovery must be handled in the right order and timing.