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RISING DAMP

This phenomenon occurs in walls in contact with the ground and can usually be seen up to one metre above ground level. The water molecules are drawn up the wall and the damp that rises is released into the environment, causing the formation of mould and associated problems. The water molecules also contain impurities; salt, for example, is the first impurity to be absorbed and when it crystallizes it expands in volume, damaging the materials and causing them to crumble. It is a white colour and in the most serious cases a fluffy deposit can be seen coming out of the wall or emerging from the cracks.