Rising damp can affect porous materials that are in contact with the ground and the presence of ground moisture. Walls & floors, internal and external will suffer from rising damp.
Measuring ground water is not simple as this varies from place to place and time of year.
Installation of a DPC and PMC helps to control the height of this dampness.
Bridging of a damp barrier in any kind will render it ineffective.
The plaster and decor can gradually deteriorate from the presence and build up of mineral salts.