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Rising dampness is defined as the vertical transmission of water from the ground, up through a permeable wall structure. The water rises up through the wall structure under capillary action, i.e. the wall acting like a wick. Rising dampness will occur in a property where either there is no damp proof course insitu, or where the existing damp proof course has become ineffective due to the breakdown of the material used, or by bridging.
Bridging of the damp proof course may be caused by many defects, including raised ground levels, high path levels, blocked wall cavities and incorrect re-
Suspended timber floors, joist ends and other timbers, which are adjacent to or imbedded into walls subject to rising dampness, are particularly susceptible to Wet Rot and Dry Rot attack.
Within a property, rising dampness often results in the breakdown and spoiling of the plaster and decoration. It can also considerably deteriorate concealed brickwork and masonry, and is very often the main cause of fungal decay to ground floor timbers.
Whereas in the past the installation of a damp proof course used to be a lengthy, messy and expensive operation, with modern treatments and applications, a new damp proof course can be installed with the minimum of inconvenience or disturbance. The objective of the newly installed damp proof course is to create a continuous unbroken barrier to rising dampness across the thickness, and along the length of the wall treated.
Dampness within a property is also a proven health hazard.
Examination and/or replacement of the internal wallplaster forms an integral part of any successful damp proofing system. Please refer to our page on remedial re-