Penetrating damp is term used for water entering a property from the exterior. It is usually caused by defects in the exterior wall, such as damaged brickwork, pointing, blocked rainwater goods or defective roof coverings. It usually appears as damp patches on inside walls. These patches will usually be concentrated around the area of the defect
Any watermarks that appear on walls, windows and ceilings will indicate that there is a penetrating damp problem. When the surveyor checks these areas of the building these areas of damp will show high moisture readings when checked.
To remedy penetrating damp, you should: