Skip to Content

Building renovation system

Moisture and building salts


Throughout their lifespan, all building elements face exposure to moisture, a potent factor causing various effects of corrosion over time. Initially appearing as aesthetic defects, these issues can evolve into serious damage, jeopardizing the structural stability of the building.

The service life of the building is partly determined by effective vertical and horizontal insulation, adaptation to water load conditions, and efficient rainwater drainage from both roof slopes and the surrounding area.

The progression of corrosion due to dampness is more pronounced in older, often centuries-old structures, but it can also affect relatively new buildings, even after a few years of operation, if proper building practices are neglected during design and construction, and operational requirements are not met.

Moisture interacting with building elements can create conditions for corrosion, material erosion, and infestation by fungi and wood-eating insects.

Renovation System Moisture LP lack of insulation

Lack of external insulation

Renovation System Moisture LP capillary rise

Capillary rise in masonry

Renovation System Moisture LP biological corrosion

Biological corrosion

Renovation System Moisture LP frost attack

Frost attack on bricks

Potential sources of building dampness

Renovation System LP Moisture Dampness sources mobile

Rainwater – direct impact on building facades, including plinths.

Capillary rise – moisture drawn through capillary pores into higher parts of the wall from a damp building element.

Splashing water – indirect impact, especially on plinths, through reflection from splash apron or adjacent areas.

Runoff – direct impact of rainwater flowing from the adjacent area or accumulating around the building, affecting its underground parts.

Leaks and failures – dampness resulting from unexpected circumstances, such as failure of plumbing fixtures.

Types of damage caused by the adverse effects of water

Renovation System LP Moisture physical damage

Physical damage – hygroscopic effects, Thermal and static ground movement

  • frost damage
  • changes in thermal conductivity
  • cracks caused by swelling or shrinkage
  • changes in materials
  • wall leaks
Renovation System LP Moisture chemical damage

Chemical damage

  • salt efflorescence
  • bursting due to salt crystallization
  • severe frost attack due to salt
  • reactions leading to changes in the structure of building materials
  • lime leaching
  • rust stains
  • chemical corrosion
Renovation System LP Moisture biological damage

Biological damage

  • microbial growth
  • algal blooms
  • moss growth
  • fungi

Building salts

Renovation System LP Moisture Building salts mobile

The destructive impact of salts is always linked to dampness in the masonry. Salts can infiltrate the structure of the partition in the form of aqueous solutions from the following water sources:

a) rainwater, runoff, used water, and groundwater;
b) water subject to capillary transport in the masonry structure;
c) water from leaking plumbing systems.

In certain instances, the walls or floors of the premises may be heavily salt-contaminated due to specific long-term operation of the building (e.g. fertilizer warehouses, barns, stables).

Renovation projects require qualitative and quantitative analyses of building salts to understand the extent and progression of corrosion. The most common salts found in damp buildings include chlorides, sulfates and sulfites, nitrates and nitrites, and carbonates.

What does the type of a salt indicate?

Analyzing the basic types of salts in the structure of damp masonry helps to identify potential sources of dampness in a building. For example:

  • Elevated levels of chloride and/or nitrate may indicate ground-related dampness.
  • High sulfate concentrations signal moisture from acid rain (sulfur compounds).
  • Presence of nitrates, nitrites, and ammonium compounds may suggest current or past biological corrosion.
  • Corrosion of concrete or reinforced concrete elements releases significant amounts of sodium, magnesium, and carbonate compounds.
  • Rainwater-induced moisture typically results in insignificant salinity levels (except for acid rain).
  • Dampness in farm outbuildings or caused by sewage system failures may involve ammonium, nitrogen, and sulfate compounds.


  • Product guide

Have a question?

We are happy to support you with any questions regarding our products, where to buy, or what is the right solution for your project.