Rising Damp occurs in buildings when moisture from the ground rises up through building materials due to a process known as Capillary Action.


Rising Damp is a very common issue in older buildings, either because no Damp Proof Course (DPC) has been fitted, or the existing DPC has failed due to age or has been bridged.

All building materials are wettable and can absorb water just like a sponge. Rising Damp appears along the base of a wall, and forms characteristic marks in the affected area. These marks are caused by salts and other nitrates from the ground travelling with the damp and then are deposited as the moisture evaporates.

Wall coatings such as vinyl wallpapers will prevent the moisture from evaporating and exasperate the issue by forcing the damp further up the wall. If allowed to continue untreated, Rising Damp can cause plaster and other wall materials to rapidly decay, and can cause Wet or Dry Rot in untreated timbers in contact with the moisture.

A particularly bad case of Rising Damp, that has caused critical damage to the wall surface.
Rising damp on external brickwork that has caused the paint to lose adhesion and expose the building structure.

Current Building Regulations require that all new construction projects are completed with an effective Damp Proof Course in place. In older buildings that never had a DPC fitted, or where the original DPC has failed, the Rising Damp must be treated in place.

It is important that Rising Damp is treated as soon as it is discovered, in order to minimise any further damage to the building structure. In addition to this, moisture that has settled in the walls of a building can aid the formation of mould spores, which can cause serious Respiratory Illness in occupants.

McGuinness Building Preservation Ltd has decades of experience in dealing with Rising Damp, and also provide a full plastering and carpentry service to our affected clients.


We offer our clients a full range of services including a comprehensive survey to identify the source of the Rising Damp & affected areas, a complete treatment of the affected areas, along with a full reinstatement of finishes.

There are two main types of effective treatment for Rising Damp – Chemical Injection and Electro Osmosis.

Chemical Injection

Chemical Injections are a highly effective method of treating Rising Damp in-situ. A solvent-free cream solution is injected into the base of the wall and quickly cures to create a moisture-repelling barrier. Due to it’s unique siliconate formulation and emulsion base, Chemical Injection creates a damp-proof network permeable to water vapour which allows the walls to dry out naturally.

Cream injection is ecologically safe and non-hazardous.

A Chemical Injection Treatment being carried out on a damp wall.
The Titanium Anode being inserted into an affected wall.

Electro Osmosis

Electro Osmosis is an innovative, effective treatment that works by introducing a very small and perfectly safe electrical charge into the wall. Using a series of titanium anodes inserted into the wall just above ground level, it repels the rising moisture molecules down the wall and harmlessly back into the ground.  As long as this tiny positive charge in maintained the protected wall remains dry and free of damp.

Rugged, reliable, and virtually indestructible, the use of grade 1 commercially pure titanium in this system gives outstanding reliability and resistance to physical attack. The power unit is fitted with an automatic L.E.D. for circuit malfunction detection, and enjoys extremely low power consumption. After fitting, the treated area is re-plastered and the system rendered invisible.

If you suspect that you have an issue with Rising Damp, or for more information on an effective Damp Proof Course, please Contact Us today.


Phone: +353 42 974 1495

Mobile: +353 87 243 2564

Email: info@mcguinness.ie

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