Efflorescence is a telltale sign of dampness in a wall. It is a white, powdery substance that forms on the surface of the wall when salts are dissolved in water and then deposited on the surface as the water evaporates. This can occur due to various reasons, including moisture penetration from outside sources such as rain or leaks, or from within the wall itself due to condensation or rising damp.
Efflorescence is usually easy to identify as it appears as a white, powdery substance on the surface of the wall. It may feel slightly gritty to the touch and can flake off when touched. Efflorescence is often accompanied by other signs of dampness, such as:
Efflorescence is caused by the presence of moisture and salts in the wall. These salts can come from the construction materials themselves, or from the surrounding environment. When water penetrates the wall, it dissolves the salts and carries them to the surface of the wall. As the water evaporates, the salts are deposited on the surface, forming efflorescence.
While efflorescence itself is not generally harmful, it can indicate underlying moisture problems that can lead to more serious issues, such as structural damage or mold growth. Mold can cause respiratory problems and other health issues, so it is important to address efflorescence promptly.
The key to remediating efflorescence is to eliminate the source of moisture and prevent future moisture penetration. This may involve repairing leaks, improving ventilation, or installing a vapor barrier. Once the source of moisture has been addressed, the efflorescence can be cleaned off with a brush or cloth. It is important to note that efflorescence may reappear if the underlying moisture problem is not resolved.