Rising Damp Treatment


How Does Rising Damp Treatment Work?

Once your damp problem has been diagnosed as rising damp, the first thing you need to do is seek professional advice. A full survey will reveal the extent of the damage, and more importantly, its root cause.

Depending on the results of the survey there are three likely courses of action for you to take. Firstly you will need to remedy the fault that has caused the problem. This may involve improving the ground drainage on the property, or in the most awkward situations it might be necessary for the owners of neighbouring properties to make changes to their drainage. If there is new building work being carried out adjacent to the property then this would be the most obvious place to start your investigations.

promo_Damp_Proofing.gifAs far as the actual, infected wall is concerned, the most important task to remedy rising damp is to repair or replace the Damp Proof Course (DPC). Traditionally this would have been carried out by undercutting the wall at the relevant mortar bed joint and inserting slate, bitumen or plastic into the wall. Nowadays this is less common and what normally happens is that a liquid damp proof course is injected into the wall. The liquid used can be a solvent based damp-proofing fluid, although these are known to sometimes cause odour problems and more often water based creams are used.

damp2.jpgInjections are made into a mortar bed around 15cm above ground level on exterior walls, and as close to ground level as possible on interior walls. By using the correct amount of damp-proofing fluid in conjunction with the correct amount of holes, a continuous layer of damp-proofing forms inside the wall and prevents any more water rising up from ground level.

If a building doesn’t have a continuous mortar bed, for example if it is built of large random stones with a rubble in-fill, an injected liquid DPC will not be able to spread effectively along the wall. In these circumstances it is possible to fit an active, electro-osmotic damp proofing system. This uses the process of electro-osmosis to keep the damp out of the walls. In simple terms a small electric charge is introduced into the wall through a series of positively charged anodes. These anodes repel free water molecules which are attracted to negatively charged cathodes placed in the wall below ground level, effectively reversing the rising damp.

Having fixed the condition that led to the ingress of water, it is equally important to address the damage inside the building. Ideally you should wait several months before replacing affected plasterwork. This gives any moisture left inside the wall a chance to leach out to the surface and avoids damage to new plaster occurring from residual moisture content. Because of the chance of hygroscopic salt deposition occurring after remedial work has been carried out damp can become a vicious circle. However, it is obviously not always possible to wait for this and most people require that the upheaval of any building and renovation work is carried out in one go.

Whether you can wait or not it is crucial that all affected plaster and paintwork is replaced, as should any affected woodwork be replaced with new, preservative treated timbers. This is particularly important if you have experienced problems with mould or rot as these are very prolific organisms and their spores can cause re-infections which can lead to further damage.

Although having a problem with rising damp can sometimes seem like the end of the world, it is a fixable problem and by enlisting the help of professional damp proof specialists you can soon overcome it.




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Contact us today on:        077 0908 4010


020 8378 0089

Unit 142 Culvert Court, Culvert Road, London, SW11 5AU