Recognising Rising Damp In London & Berkshire:
The main indicator of rising damp within a property is any damage that is contained within the first meter from the floor up. Other characteristics found within the damage are explained below.
Discolouration of plasterwork and the interior walls:
It is usually easier to spot rising damp on walls that are painted rather than papered, because groundwater is not clear like drinking water it will leave behind a discoloured watermark. Plaster and paint will appear discoloured and be crumbling from the bottom of the wall with a tidemark about a meter up from the base of the wall.
On papered walls, the wallpaper may peel away at the bottom of the wall. On inspection if you feel a crunchy texture behind the paper then you can almost guarantee you have rising damp. The crunchy, granulated texture is created from salt deposits after the groundwater, which was absorbed into the wall, has evaporated.