• A wall structure can be considered “pathologically humid” when its water content is greater than 3% of the weight of its materials.
  • When the wall is unable to dispose of the water present in its constituent materials on its own and in an adequate quantity.
  • When there are significant quantities of salts in solution, of different origin and nature.
  • When adverse environmental conditions are present, or recurring(for example, alternations of “freeze-thaw” cycles, capable of causing secondary alterations in the states of equilibrium).