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Concrete floors are susceptible to rising damp through the same capillary process as walls. In principle all concrete floors should include a damp proof membrane across the whole floor area and this should be linked to the damp proof courses in the surrounding walls to provide continuity of protection against ground moisture. As an alternative, an epoxy resin coating can also be applied across the floor to seal it against damp.
When these have been measures are omitted, or in older properties that did not have them installed during construction, or if the existing membrane has failed then there are two options available:
The first option is to use an epoxy resin coating applied across the floor surface to seal it and prevent damp migrating to the surface. This is a simple operation as long as the floor can be cleaned and prepared to remove any existing floor coverings, and if the floor has not started to break down due to mineral or salt action
The second option is to lay a thin but tough cavity drain membrane on top of the existing concrete surface. These are laid as part of a waterproofing specification for basements but they are equally successful as a tough floor membrane. The process involves removing the existing floor coverings and skirting boards, laying a cavity membrane, normally 3-5mm thick, and lay a timber floating floor on top, and then refix the skirting boards.
It is important to note that the provision of a barrier against rising damp will only prevent further moisture rising from the ground and that all other sources of dampness must be eliminated as well.