What is Rising Damp?

Rising damp is a common term used to describe the upward movement of groundwater through porous building materials, such as masonry or concrete, by capillary action. It occurs when moisture from the ground is absorbed into the walls or floors of a building, leading to dampness and potential damage.

Several factors contribute to rising damp, including the absence or breakdown of an effective damp-proof course (DPC), which is a barrier installed in the walls or floors of a building to prevent moisture from rising. When a DPC is missing, damaged, or bridged (allowing moisture to bypass it), groundwater can be drawn upwards through the porous materials, causing damp patches, discoloration, and even structural problems over time.

The symptoms of rising damp may include damp or discolored patches on walls, a musty odor, peeling wallpaper, salt stains, decay of skirting boards or floor timbers, and in severe cases, mold growth. It’s important to address rising damp promptly, as prolonged exposure to moisture can lead to damage to the building’s structure and create an unhealthy living environment.

To prevent or mitigate rising damp, several measures can be taken, such as repairing or installing an effective DPC, ensuring proper ground drainage away from the building, improving ventilation, and maintaining the exterior walls and masonry. Consulting a professional surveyor or damp specialist is recommended to accurately diagnose and address rising damp issues in a building.