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The most common type of moisture problem is rising damp. Moisture from the
ground rises, by capillary action, up the walls. The moisture often carries
salts which are deposited on the face of the wall when the moisture
evaporates. Internal decorations are stained and damaged, plaster can debond
and become loose.
Rising damp normally extends up to 1 metre above ground
level, the capillary forces cannot lift the moisture any higher. Normally
walls are protected against rising damp by a damp proof course built into the
wall. Very old properties did not have damp proof courses, and old properties
may have damp proof courses which have become ineffective. Sometimes the
outside ground levels are raised above the damp proof course.
The solution to rising damp is usually to inject a chemical damp proof course,
and to re-plaster the internal walls with a waterproof layer up to 1.2 metres
high. After which a 30 year guarantee certificate will be issued.
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