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Rising Damp

Rising damp is the upward movement of moisture in walls as a result of building defects, water leaks, flooding and poor workmanship, moisture travels by capillary action through small pores in the wall.

This causes problems when the moisture penetrates interior finishes and becomes in contact with timber causing decay and rot. Often this moisture will carry salts from the ground (Chloride/Nitrate) and when the dampness evaporates, these salts become concentrated in the plaster and walls. These salts are hygroscopic and can absorb moisture from the air inside the house leaving the walls visibly wet.

Effects of Rising Damp

If the damp walls remain untreated it can cause further problems for the building. Moisture levels may rise to a point at which any timber along the base of the wall may become affected by Dry rot, Wet rot or Woodworm. This can lead to major structural damage and the decay.

Signs of Rising Damp

Rising damp is often misdiagnosed and confused with condensation and water penetration.

The height of rising damp depends on the size of the pore ( the smaller the pore the higher the rise). Therefore, the maximum height rising damp usually reaches is a little over 1m to 1.5m.

If rising damp is present you would see a ‘tide line’ of discoloured staining or bubbling plaster. There may also be signs of dampness and rotting of flooring or skirting board. Damp conditions allow for fungal growth which, not only looks bad and damages finishing’s, it is a health hazard.

  • Flaking Paint
  • Discoloured Staining
  • Bubbling Plaster

Call Us Today

For expert advice call us today on (01) 2340048 (Dublin) or (052) 6128454 (Tipperary).
Alternatively you can email us at

What We Recommend

Almost all modern properties are built with a damp proof course (DPC) placed below masonry walls to prevent rising damp. Some properties may have been built without this damp-proof course or sometimes the existing one may fail which would result in rising damp.

We advise that you get expert advice before making any decisions on treatments.

Acorn Property Preservation can provide a detailed survey report to specify remedial treatments and works to be carried out by our experienced team of technicians and trades people, or work in conjunction with your local trusted trades people.