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It is essential that contaminated plaster is replaced to ensure successful treatment of rising damp. Ground water contains soluble chloride and nitrate salts and these are pushed up and deposited in the wall by capillary action. These soluble salts are likely to be hygroscopic, meaning they can attract moisture from the air and will migrate to the surface of the plaster to cause damp patches. To prevent this salt migration a non-porous plastering system, which contains special additives is required. The old plaster is hacked off to approximately 1.2 metres and replaced with a coarse sand and cement render in the ratio of 3:1, incorporating both a waterproof and salt inhibiting additive. The wall is then finished with a skim coat of finish plaster.