Removing salt efflorescence – causes and solutions

White spots or crystalline deposits on the masonry are typical signs of so-called salt efflorescence, colloquially often referred to as saltpetre. They occur mainly on damp walls in the basement or ground floor area and indicate earlier or still existing moisture in the masonry.

When water passes through the masonry, it takes salts from the soil. If the moisture on the wall surface evaporates, these salts remain. This becomes visible as a white, often powdery layer. In addition to the unsightly appearance, salt efflorescence can damage the plaster and affect the building structure in the long term.

• Rising soil moisture

• Side penetrating water

• Damage to seals

Many customers report that after using Drymat, the typical white efflorescence on the walls has gradually disappeared. At the same time, the indoor climate was perceived as more pleasant and the walls noticeably drier.