Salt contamination is not only caused by Rising dampness.
Other sources of salt contamination of masonry and plaster are:
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.