Rising damp is salty ground moisture that rises by capillary action up a brick or masonry structure e.g. wall or fireplace. Also known as “salt damp”.
Rising damp occurs at the base of brick or masonry structures.
The installation of a new damp course into an existing brick or masonry structure (at floor or ground level) stops rising damp.
Internal rendered walls: allow to dry for a minimum 3 months before anyre-rendering/re-plastering.
External bare brick walls: allow to dry for a minimum 12 months, followed by salt removal, before any surface decoration.
Mould is a product of poor room and/or sub-floor ventilation, and not due to rising damp. Increasing ventilation through opening doors and windows and installing sub-floor vents (pressed metal or cast iron) will alleviate this problem.