One of the most evident and annoying effects of capillary rising humidity
is plaster bulging and crumbling in the lower wall area.
What we mean by "rising humidity"
A solution of water, salts, and other substances rises from the ground, not "pure" water . The solution commonly known as humidity (or water) contains various elements of a non-homogeneous composition.
After rise, moisture emerges
When the solution rises to a certain height of the wall, tends to move outwards through plaster and paints. During this process water evaporates while salts crystallize pushing plaster from the inside out (and over time also structural material portions). Furthermore, it is known that in case of iron inside the walls (for example reinforced concrete pillars), salts activate a corrosion process which, over time, causes substantial structural damages (and economic ones, if you decide to restore).
Only water actually evaporates
In evaporation process, water (actually evaporating element) alters the building environmental humidity causing excess humidity and unhealthy environments that feed spores and mold proliferation and, often cause infections and respiratory diseases.