Rising damp can cause significant structural damage to buildings. It occurs when groundwater rises through walls, bringing pollutants like saltpetre, which can degrade building materials over time. Signs of rising damp include mould, blistering, peeling paint or wallpaper, and damaged render. This issue is often caused by a damaged or absent damp-proof course (DPC), especially in older properties.
While DPCs have been in use since the early 20th century, many older buildings may have improperly installed or deteriorated physical barriers, making them vulnerable to rising damp. Additionally, modern renovations or changes in ground levels can compromise these barriers, allowing damp to affect areas previously unaffected.
How to Treat Rising Damp
Before treatment can begin, any salt-contaminated plaster and affected skirting boards must be removed. Typically, plaster is hacked off up to 1.2 metres above the highest point of dampness. Once the brickwork is exposed, a remedial DPC is injected directly into the masonry using Dryrod Damp-Proofing Rods, ensuring a targeted and long-lasting solution.
These rods are inserted into drilled holes at regular intervals along the lowest accessible mortar course, creating an effective damp-proof barrier that prevents further rising damp. However, while this treatment stops damp from spreading, it cannot reverse existing damage caused by salts and moisture in the walls. As a result, affected plaster will often need to be replaced.
Restoration After Treatment
To restore the affected area, a two-coat rendering system is applied using Sika 1 waterproofing additive. This solution blocks the capillaries in the render, providing an additional barrier against moisture. Once the render has dried, a smooth finish of multi-finish plaster is applied, leaving the wall ready for painting.
If you suspect rising damp in your property, Smiths Damp Proofing Ltd can help. Our expert team offers professional assessments and effective treatments to protect your home.
Contact us today to discuss your rising damp concerns and arrange a survey.
