Salt Damp - Hygroscopic Salt Contamination

Salt contamination is not only caused by Rising dampness.

Other sources of salt contamination of masonry and plaster are:

• Combustion gases in chimney flues contain traces of acids which form chlorides, nitrates and sulphates in the masonry. This is a common source of contamination at the surface of chimney breasts and reveals at all levels (upper floors as well as ground floor level).
• Prolonged leakage of tap water or central heating water.
• Leakage of soil water or contamination with urine. (Salts from animal urine are often responsible for salt damp problems in barn conversions/stables etc.
• Direct rain penetration

As these salts are often hygroscopic (Moisture Attracting), patches of dampness may appear and disappear depending on the weather. This can sometimes be confused with a leak occuring. This is why it is important to have a qualified surveyor investigate.

We have a range of specifications designed to deal with salt contamination. These will result in a dry and protected surface.