We specialise in waterproofing - Call for a professional quote today! Rising damp, also called Salt Damp, is caused by the rise of moisture being drawn up into the base of the wall through capillary action. Wherever there are moisture absorbent materials such as brick, mortar, or renders in contact with the ground then the moisture will rise through them unless there is a barrier in the form of a damp course. The dampness will continue to rise unless treated.