L'rising damp it is a phenomenon due to poor waterproofing of the foundations. Its presence depends on the porosity of the masonry and the amount of water present in the subsoil. The salts present in the ground and in the building material dissolve in the water and rise, due to the capillary effect, to the surface. The water evaporates but the salt remains in the plaster and once crystallized, it increases its volume causing a push towards the plaster and the building material. In addition to creating unhealthy environments, therising damp causes a series of damages up to a deterioration and static weakening of the structure. L'rising damp generally affects old buildings, with load-bearing walls in direct contact with the ground, but does not spare the new ones, if the waterproofing of the walls facing the foundations has not been carried out correctly. Humidity can increase in the cold or rainy months, due to the lack of evaporation.
Rising humidity, alarm bells
The presence of moisture in the walls can be determined by some factors:
- halos that rise from the floor along the wall
- appearance of mold and saline dust
- chalking of the plaster
- stale smell.
Rising humidity, related damage
L'rising damp in addition to compromising the health of the environment, it involves aesthetic, static and economic damage:
- Breakdown of plasters and mortars
- Instability of the entire structure: in the worst case
- Yellowing of the paint
- Detachment of the plaster
- Excessive heating costs: due to cold walls it causes evaporation.
- Ruined furniture, upholstery, etc.
Rising humidity, how to intervene
These are palliative interventions that help but do not solve the problem definitively:
Use evaporating plasters and paints
Reclaim the environment with a series of holes into which a waterproofing resin is injected
Remove part of the masonry and replace with metal or plastic materials: stability could be compromised, especially in the presence of particularly degraded and crumbling buildings
Place special cartridges near the area affected by rising damp: they help improve natural ventilation.
Useful information: the aforementioned interventions can improve the transpiration of the masonry and thus facilitate the evaporation of the moisture present, but do not intervene on the causes. It should be noted that the problem of humidity remains and sooner or later it could recur.
What to do if you are in the process of building?
- Reclaim the subsoil that will host the construction
- Avoid load-bearing walls
- Use lime-based plasters: they are more breathable and elastic